At the May Day protest, police action spirals out of control. A body is found in a canal. An unsuspecting Svetlana returns to her apartment.

Rath confesses to a priest -- and later to Wolter. Charlotte charms medical student Rudi into performing a secret autopsy, which uncovers a vital clue.

Rath's pharmacist gets shady instructions. Rath learns who's behind the train smuggling operation and why, and recalls the last time he saw his brother.

A mass grave is found in the woods. Charlotte's sister Toni makes a troubling discovery. A meeting with Homicide leads Rath to a dreadful realization.

Rath hits an unexpected snag while investigating the Benda case, and later tracks down the movie set gaffer. Charlotte is visited by her older sister.

Evidence from Krempin's home reveals his and Rot's interest. A neighbor gives Charlotte something her mother left. Gräf accesses the Benda case file.

As a dead man on a park bench in the Tiergarten grabs the attention of the homicide squad; Toni gets caught; Charlotte makes a terrible decision.

Weintraub investigates boxing match betting fraud; Rath confesses to Charlotte, who asks him to find out more about Benni's death.

Rath brings Moritz to the castle; Charlotte tells a lawyer about the deaths among street children; Goldstein takes drastic measures.

Widow Behnke kicks off her high-stakes rescue plan; Stennes instigates a hall battle in the Moka Efti; Charlotte makes a secret observation.

Malu Seegers and Dr Völcker pursue a deadly plan; Charlotte makes a terrible discovery; Helga tries to escape from her kidnappers.