Suspended FBI agent Gabriel Ladner gets back to work when a series of brutal murders happened in Los Angeles. Next to the corpses, there is a blood-written message: "Forgive our sins". Helped by his best friend, Elijah Drench and the clever profiler Sarah Baker, he quickly discovers that those crimes are the work of a group of young serial killers nicknamed the "Seven Deadly Sins" by the press. As he tries to stop them, Ladner struggles with the following issue: how can you catch people who vanished as they were ghosts?
