During a recent undercover sting gone bad, hit man Gustavo Toro died in the arms of FBI Special Agent Daniela “Dani” Vega. But Toro had secrets he refused to take to the grave. In the event of his death, Toro left behind a video that promises to expose a mysterious mastermind who has been operating with impunity for decades. But there’s a catch. Dani’s team must follow Toro’s cryptic clues on a cross-country hunt for justice, and piecing together his past is more twisted than Dani could have imagined. But as Dani and her team race to gather the evidence, it’s clear this powerful adversary will stop at nothing to keep their secrets --- including eliminating those who threaten to reveal them.

Carmen Sanchez is a tough Homeland Security agent who plays by the rules. But when her sister is attacked, revealing a connection to a series of murders across Southern California, she realizes that a conventional investigation will not be enough to stop the ruthless perpetrator. With nowhere else to turn, Sanchez enlists the aid of Professor Jake Heron, a brilliant and quirky private security expert who believes rules are merely suggestions. The two have a troubled past, but he owes her a favor. They team up to catch the assailant, who has no discernible motive and fits no classic criminal profile. All they have to go on is a distinctive tattoo and a singular obsession that gives this chillingly efficient tactician his nickname: Spider. Over the next 72 hours, Sanchez and Heron find themselves in the midst of a lethal chess match with the killer as they race to stop the carnage.