When famous war reporter Cooper (Conway Teale) is found shot dead, no less than three men claim they carried out the murder! Cooper's body indeed does have three bullets in it but which man was the first to fire (and thus the actual murderer). All three men are found guilty but Professor Varney (Ferdinand Gottschalk) heads to prison with a lie detector to try and find out who is the true murderer.
Trude (Hardie Albright), McCaigh (Jameson Thomas) and Krenwicz (George Baxter) take turns to explain why they hated Cooper enough to kill him. Cooper's facade as a respected journalist is soon stripped away as he is revealed to be a cheat, a womaniser and a crook. Varney has the results of the lie detector test, and he has two pardons to hand out...
This film has a great (if slightly suspect in legal terms) plot though the film is rather poorly made at times. However, the story flows well and has some decent suspense.