Raimy and Frank make a huge discovery while continuing their search for the Nightingale. Meanwhile, Stan is willing to do anything to bring Frank down.

A female police detective in 2016 discovers she is able to speak via a ham radio with her father (also a detective) who died in 1996. They forge a new relationship while working together on an unresolved murder case, but unintended consequences of the ‘butterfly effect' wreak havoc in the present day.