An FBI agent with a background in cryptography. A brilliant game maker bent on revenge. A deadly battle of wits and wills. An ingenious thriller from the Wall Street Journal bestselling author of The Cipher. FBI agent and former military codebreaker Daniela “Dani” Vega witnesses a murder on a Manhattan sidewalk. The victim is chief of staff for a powerful New York senator. The assassin turned informant is Gustavo Toro. His code: hit the target and don’t ask questions. When Dani suspects a complex conspiracy, the only way to take down the mastermind is from the inside, forcing her to partner with Toro. Together they must infiltrate the inner circle at a remote facility. Except it’s a trap. For all of them. Locked in a subterranean labyrinth and held captive by an unseen host, Dani, Toro, and others must fight for their lives. Now Dani must stay undercover, unravel a bizarre conspiracy, and survive lethal puzzles. But will Toro be friend or foe? Because in this killer’s game, everything is real: the paranoia, the desperation, and the body count. And only one person can make it out alive.

An FBI agent tracks a brilliant serial killer in New York―right back to her own cold-blooded past in a riveting thriller by the Wall Street Journal bestselling author of The Cipher . FBI Special Agent Daniela “Dani” Vega was seventeen when her mother murdered her father. Ten years after Dani’s own damning eyewitness testimony sealed her mother’s fate, she’s starting to have doubts. What if she got it all wrong? A veteran NYPD homicide detective agrees to reopen the closed case on one condition―Dani must help him find a serial killer who’s been operating throughout New York City for the past decade. If anyone can decipher his patterns, and his riddles, it’s a trained codebreaker like Dani. The killer knows this too. And his next riddle―and victim―are meant just for her. For Dani, stopping a killer―and learning what really happened to her father―becomes more personal and more dangerous with each new twist. As secrets of the past are unearthed, the truth could forever change Dani’s life…and the lives of everyone she loves.

A dead man’s riddles—and secrets—thrust an FBI codebreaker into a deadly cross-country race for justice in a propulsive thriller by the Wall Street Journal bestselling author of The Cipher. 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.