In 2016, Raimy meets a strange character named Karl, who speaks to himself in the future. In 1996, Frank feels like he's being taunted by the Nightingale. Meanwhile, having discovered new information, Raimy and Frank set up a plan to use the Nightingale's next victim as bait.

A cold-case victim leads Raimy and Satch to a big break in the investigation, a room where the Nightingale held his first victim.

Raimy and Satch discover a shocking connection to the Nightingale's first kill. When Raimy shares this news with Frank, he works to dig up additional information. Meanwhile, Frank and Julie are forced to have an honest conversation, and Raimy has a surprise visitor.