But to complete the team, he must track down his former partner, Mia Kruger - a brilliant but troubled detective - who has retreated to a solitary island with plans to kill herself. Reviewing the file, Mia finds something new - a thin line carved into the dead girl's fingernail: the number 1.

She knows that this is only the beginning. To save other children from the same fate, she must find a way to cast aside her own demons and stop this murderer from becoming a serial killer.