Jack is a 26-year-old penetration tester with bright red hair. She handles the physical infiltration side of her and her husband's company, Crossways Security. Independent and resourceful, she relies heavily on her intuition and physical stamina. When she discovers her husband murdered and realizes the police view her as the prime suspect, she goes on the run to identify the true killer.

Gabe is a skilled coder and security expert who handles the technological side of Crossways Security. He works as a hacktivist who uses his computer talents to find and report vulnerabilities in software. His sudden, violent death serves as the inciting incident that forces his wife into a life on the run.

Cole is an information technology expert who works for Cerberus Security, creating apps and evaluating mobile phone security. Having met Gabe in grade school, the two share a long-standing friendship built around their mutual interest in computers. Following Gabe's death, Cole offers Jack the use of his girlfriend's remote cabin and supplies burner phones to help her evade the police.

Hel is Jack's sister and a journalist with experience writing about contract killings. She operates as a realist, quickly deducing that Gabe's murder resembles a professional hit and warning Jack that she will be the prime suspect. She sneaks supplies, clothing, and burner phones to Jack while maintaining her normal family life.

Jeff is a police officer who dated Jack several years prior. He uses his authority to intimidate others and takes pleasure in cornering people who cannot fight back. Jack's past relationship with him involved escalating control and abuse, leading to a permanent distrust of law enforcement after his colleagues protected him from consequences.

Habiba Malik is a Detective Sergeant assigned to investigate Gabe's murder. Tough and determined, she quickly zeroes in on Jack as the primary suspect due to a lack of alibi and missing physical evidence. She uses relentless pressure tactics, including tracing burner phones and attempting to convince Jack to surrender.

Miles is a detective working alongside Malik on the Gabe Medway murder investigation. He handles the procedural questioning, asking Jack about specific weapons and missing hardware from her home.

Roland is Hel's husband and the father of their twin daughters. He provides a comfortable, stable domestic environment that contrasts sharply with Jack's current situation.

Lucius is an American traveler staying at a London hostel. He anonymously covers Jack's room charge when the front desk refuses to accept her cash, asking only that she pass the kindness on to someone else.

Keeley is an employee at Sunsmile Insurance who stays home to care for a sick child. Jack uses Keeley's lax social media privacy settings to steal her login credentials and impersonate her to bypass corporate security.

Madrox is a young hacker who arranges a black-market deal with Jack. He agrees to route Gabe's phone number to a burner device in exchange for Bitcoin, demanding additional payment when the cryptocurrency exchange rate fluctuates.

Bill is a truck driver who gives Jack a ride despite recognizing her from news reports about Gabe's murder. Having served time for a crime he did not commit, he harbors his own distrust of the police and chooses to help her.

Mike is a truck driver acquainted with Bill Watts. He provides Jack with transportation back to the city, expressing concern that her disheveled appearance is the result of domestic abuse rather than criminal flight.

Verity is Gabe's mother. She receives a phone call from Jack early in the investigation when Jack attempts to inform the family about the sudden tragedy.