DP 3. Murder Mountain

Complete with its short detective story by the fictitious author Morris East, which is full of clues and suspects, the assembler of this 500 piece fully interlocking cardboard jigsaw puzzle is tasked with the objective of identifying the murderer of Graham Cordwallis. This puzzle is numbered as the third in the series, the back of the box detailing five further titles in the set.
Many thanks to Alan Sudbury for the supplied details and images.

Artist: Unsigned
Date: c1975
Brand: Detecto Puzzles
Material: Cardboard
Nationality: British
Number: DP 3.
Pieces: 500
Size: 15" x 20"
Theme: Mystery
Title: DP 3. Murder Mountain