Frazier arranges to meet Crombie at his flat but finds him dying with the words "North Star". When Ross arrives the body and the "North Star" model ship have gone. Frazier is given Denston's case which holds a lithograph of same the ship.
Frazier discovers that Caudwell must have had the diamonds on him when he was murdered. He breaks into Barbara Day's flat and discovers diamonds hidden in a cigar. Van Dakar warns him about Day lacing his coffee but is killed.