Emily and Nick are finally reunited with Flynn back in Boston, but the threat of Elliot's bioweapon still looms large. Emily resorts to drastic measures and make a dangerous choice to ensure her family's safety.
Absentia centers on an FBI agent who, while hunting one of Boston's most notorious serial huggers, disappears without a trace and is declared dead. Six years later, she is found in a cabin in the woods, barely alive and with no memory of the years she was missing. Returning home to learn her husband has remarried and her son is being raised by another woman, she soon finds herself implicated in a new series of murders.