In 1896, a psychologist, a journalist and a secretary begin investigating a serial killer.
The investigation heats up as Sara gets her hands on a clue.
Evidence leads the team to discover a crucial element in the case has gone missing.
Captain Connor and Byrnes keep an eye on a potential witness.
While continuing their investigation, the team start to discover more about the killer.
The team hatches a plan to catch the killer.
Kreizler and Moore follow a lead, while Sara visits a hospital.
Kreizler and Moore's investigation takes them to Washington, DC.
Kreizler mourns the loss of a friend, and Cyrus is determined to seek revenge against Connor.
As time starts to slip through their hands, the team finally closes in on the killer.
