After an independent computer researcher with a contract with the Defense Department is found murdered, Don and his team are called in to find out who is responsible. After Don recruits Charlie to decode the murder victim's cryptic computer data, Charlie uncovers he was working on a secret and potentially damaging project, forcing Charlie to question the impact of his own life's work.

As Don investigates the prison bus crash, Charlie uses of probability analysis to conclude that the bus crash was not an accident, but part of a conspiracy to free a dangerous killer. Now, Don and Charlie must discover the killer's lethal agenda and stop him before he is able to carry it out.