When the body of a man is found in a park, it falls to Dr Lucien Blake to use his unorthodox methods and find out not just how he died but also the man's true identity.

Jean is at the cinema when, to everyone's horror, there is a fire in the projection room and the projectionist, who couldn't get out, is burned to death. Dr Blake investigates and follows the trail to something murkier than even he had imagined. Meanwhile there is romance in the air for Jean with the brave fireman who tried to rescue the projectionist.