Jack enlists the help of an autistic man in the search for Gredenko, and Sandra Palmer makes a fateful decision.

Dexter figures out who the Ice Truck Killer is, along with a dark secret from his troubled past. Meanwhile, La Guerta is replaced with a new boss and Angel figures…

The Ice Truck Killer sets a trap for Dexter by kidnapping someone close to him; Dexter’s increasingly odd behavior piques Doakes’s interest.

The Ice Truck Killer leaves severed body parts from his victims at locations that are linked to memories from Dexter’s troubled childhood, which begins to get into Dexter’s head.