In the pulsating episode 19 of CBS's "Tracker" season two, Melissa Roxburgh reprises her role as Colter's sister, Dory, who arrives with a mysterious box filled with their father's belongings. Dory dismisses the contents as unimportant, but Colter (Justin Hartley), ever the investigator, recalls his father's paranoia about his ideas being stolen. Believing that his research may have cost him his life, Colter's curiosity is piqued.

As their father was a genius, Dory reminds us that he was also slipping into madness. Meanwhile, Reenie (Fiona Rene) calls in a panic, requesting Colter to rush to Seattle. Her client Leo Sharf's assistant, Francie, has disappeared without a trace. Leo (Pej Vahdat), fearing bad publicity for his upcoming company launch, hesitates to involve the authorities.
Francie was working on Leo's speech when she was last seen alive, and when she failed to answer her phone the next morning, Leo and Reenie made a beeline to her hotel room. The door was answered by silence and the security footage showed no one entering or leaving after midnight.
Francie's hurried departure through the window and fire escape suggests she was under duress. Leo suspects a rival company might have snatched her due to the value of his work. However, an email arrives with a video of Francie reading a chilling statement - she'll die if Leo doesn't transfer $5 million within an hour.
Leo's bank informs him that such a large sum cannot be transferred so quickly. Bobby (Eric Graise), with his tech savvy, tracks the IP address to a location 35 minutes away from Leo's office. With time running out, Colter sprints towards the location, scaling fences as he goes. He arrives just in time to find the room where the video was shot but Francie is nowhere to be seen. Blood on the wall behind the chair hints at a violent encounter. A sign reads, "You broke the rules."
Colter informs Reenie and Leo that the kidnappers had no intention of releasing Francie. He arrived before the timer expired. While on the phone with them, Colter discovers a bullet without any tissue on it, confirming his suspicion that this is a setup and not a corporate kidnapping. Someone has a personal grudge against Leo. Reenie brings up Sheldon Grimes, one of Leo's company founders who was asked to resign last week. It turns out that Sheldon has connections to this warehouse, setting up a dangerous and twisted plot twist for "Tracker" season two.
Leo is convinced that Sheldon, who resides downtown, has conspired with Francie to sabotage the company's launch. Colter, on a hunch, heads to Sheldon's townhouse and finds the door ajar. Inside, he discovers Sheldon's cell phone, indicating an urgent departure. Reenie urges Leo to call off the launch, warning against confronting Grimes at this delicate juncture. Leo, however, insists on the importance of delivering the resignation personally, given their long-standing relationship.
Reenie cautions that cancelling the launch would only lead to avoiding mentioning Francie's involvement. She suggests blaming the delay on the chip company. However, she understands that any attempt to cover up would ultimately fail, as the truth about Francie's involvement would inevitably leak out, leading to disastrous publicity for the company.
Colter continues his search on the yacht, discovering a photo album filled with images of a woman who has been abused. It is the file Reenie had compiled with the dirt they had unearthed, revealing Grimes as a serial abuser. As he browses through Sheldon's laptop, which is still on the boat, he notices an open box of bullets beside it.
Reenie seizes the flash drive and sends Elliott to check if any papers were left in the conference room. However, as she is talking on the phone, someone grabs her from behind, and the line goes dead. Colter rushes to the office and finds boxes and papers scattered on the floor. He follows Reenie's ringtone and finds Elliott unconscious. Calling for help, he later walks an FBI agent through the events of the past few hours. Reenie's purse and phone are found, but there's no sign of her.
The agent learns that Sheldon used his keycard an hour before Reenie arrived. Colter spots a high-heel print and is proud to suggest it indicates a fight put up by Reenie. Moreover, there are two handprints of different sizes, indicating involvement by two people. One attacked Elliott while the other grabbed Reenie.
Despite wanting to help with the investigation, Colter is told he is not needed. Leo pulls Colter aside and confirms his desire for him to remain on the case, which Colter assures him he was not planning to stop anyway.
Bobby obtains ATM footage from a bank camera and sees a black SUV leaving after Reenie's arrival, with the license plate unreadable. However, using Reenie's smart ring that tracks her sleep, Bobby tracks her location and sends Colter the address. Colter speeds over to the destination with renewed determination to find Reenie and bring her home safely.
A sleek black SUV, its tinted windows obscuring the interior, sits parked outside a warehouse, its resting spot after a night of subterfuge. Within its confines lies Reenie's tracker ring, a crucial piece in a game of cat and mouse. Colter, his eyes sharp and alert, scours the alley, his steps light on the gravel as he discovers Francie, her body bound and her eyes wide with fear. But Colter's calm demeanor soothes her as he effortlessly frees her from her bonds.
The FBI's arrival is swift and their presence unsettling. Francie's narrative spills forth, her voice trembling with terror as she recounts the men with ski masks who abducted her. She claims never to have seen Reenie and believes the duo were acting on a larger directive, fueling the suspicion that Sheldon Grimes might be the mastermind behind it all. The sentiment is shared by Leo and Reenie, both of whom see Sheldon as a ruthless businessman who will stop at nothing to get what he wants.
The agent apologizes for their earlier misstep in attempting to dissuade Colter from the case, recognizing the need for collaboration. They both agree that Reenie is a more valuable target, hence Sheldon's interest in her life over death. Grimes' phone records reveal a flurry of calls to former associates, suggesting he was seeking help in his quest against Leo.
The SUV's registration points to Jimmy Pike, a man with a checkered past involving a botched murder-for-hire scheme. As Reenie is ushered into a room with Grimes, her heart races with fear. Grimes, also tied up, claims Leo is the mastermind and that Reenie has no idea who he truly is. But Reenie's fear turns to shock when her captors enter the room and execute Grimes.
Bobby's research into Leo's enemies yields a startling revelation: Francie is related to Cyrus, a programmer who committed suicide after Leo profited off an algorithm he created. Leo had no knowledge of Francie's identity when he hired her as his executive assistant, unaware that she was Cyrus' younger sister seeking vengeance for her brother's death.
Colter believes Francie targeted Reenie because of her close ties to Leo. Her meticulous planning and strategic moves have kept them all at arm's length until now. Bobby provides Colter with the address of a commercial property Francie rented months ago, leading him to the warehouse where the standoff unfolds.
Francie storms into Leo's office, gun in hand, her true identity revealed in a flash. She demands to know why Leo abandoned their family after Cyrus' suicide, her voice laden with bitterness. She forces Leo to his knees, threatening to blame everything on Grimes and holding his weapon as evidence. As she demands Leo confess to his wrongdoing, Colter sprints around the warehouse and takes down one of the kidnappers as they move Grimes' body outside. The other rushes back in to finish off Reenie, but Colter is hot on his heels.
Reenie cries out in terror as the gun approaches her head, but Colter intervenes just in time, knocking the man unconscious and saving Reenie from certain doom. Shaken but alive, Reenie clings to Colter in a desperate embrace, her tears falling like rain. Colter reassures her that Elliott is safe at the hospital.
As this dramatic scene unfolds, the FBI bursts through Leo's door just in time to stop Francie from finishing what she started - a climactic moment that brings an end to the night of intrigue and betrayal.
With the case closed, Colter unwinds with a chilly beer in his trailer, his mind drifting towards rummaging through his father's box. Just as he was about to delve in, Reenie appeared, her heart filled with gratitude as she headed to the hospital to visit Elliott. She paused to express her heartfelt thanks to Colter for saving her boyfriend's life. "Thank you for saving my life," she whispered, her eyes brimming with emotion. Colter replied with a soft smile, "You would have done the same for me."
Reenie shared her conversation with Leo, who had denied stealing Francie's brother's work. The FBI had told her of Leo's unwavering devotion to her, and while she wasn't certain if he was involved with Cyrus's work, she couldn't bring herself to believe he wasn't a good person. She saw him as complicated, and Colter admitted that he could understand Francie better than Leo.
As Reenie hugged him goodbye, Colter's fingers started to explore the contents of his father's box. The box held a collection of papers, rocks, and a journal. As he flipped through the pages, he stumbled upon a hidden note that had escaped Dory's notice - it was tucked away in the binding of the journal! Excitedly, Colter dialed the number on the note, only to hear a dull ring of a disconnected line.