While hunting one of Boston’s most notorious serial killers, FBI agent Emily Byrne (Stana Katic, Castle) disappears without a trace and is declared dead. Six years later, she is found in a cabin in the woods, barely alive, with no memory of what happened to her while she was in captivity. Returning home to learn that her husband (Patrick Heusinger) has remarried and her son is being raised by another woman, Emily soon finds herself implicated in a new series of murders.