Episode 1

S04 E01 • Sunday, Jan 7, 1973 • Jan 7 • 1h 30m

A man collapses in Beethovenstrasse. His murderer flees. The dead man, a private detective from New York, was on the trail of an international blackmail ring. Supported by customs investigator Kressin, Sandy, the dead man's partner, takes over the case. He manages to sneak into the blackmail ring. But the turbulence of the Cologne carnival makes the case more and more confusing, inscrutable and ultimately ends in a dark, bloody nightmare.

Episode 2

S04 E02 • Sunday, Feb 4, 1973 • Feb 4 • 1h 30m

Episode 3

S04 E03 • Sunday, Mar 4, 1973 • Mar 4 • 1h 30m

Episode 4

S04 E04 • Sunday, Apr 1, 1973 • Apr 1 • 1h 34m

Episode 5

S04 E05 • Sunday, May 13, 1973 • May 13 • 1h 30m

Episode 6

S04 E06 • Sunday, Jun 24, 1973 • Jun 24 • 1h 30m

Kressin and the two jade ladies

S04 E07 • Sunday, Jul 8, 1973 • Jul 8 • 1h 30m

Having just arrived by plane from Istanbul, Kressin is waiting at the baggage carousel, keeping an eye on the charming Asian woman Lyn, who was sitting next to him on the plane. Instead of his suitcase, a corpse is wheeled up, and Lyn has suddenly disappeared. Since 350,000 marks were found on the dead man, Kressin searches for the murderer in the smuggling world and stumbles upon two chess pieces that cause a stir.

Episode 8

S04 E08 • Sunday, Aug 19, 1973 • Aug 19 • 1h 30m

Episode 9

S04 E09 • Sunday, Sep 30, 1973 • Sep 30 • 1h 30m

Episode 10

S04 E10 • Sunday, Nov 11, 1973 • Nov 11 • 1h 30m

Episode 11

S04 E11 • Sunday, Dec 9, 1973 • Dec 9 • 1h 30m