Harry Flock has had a temporary promotion as acting manager of a branch bank. He is honest and meticulous to a fault, but in danger of losing his job when head office gets anonymous complaints about alleged embezzlements. His accounts are immaculate - in fact, they seem too good to be true.

Criminal lawyer Slade has his reasons for wanting his colleague dead. He meticulously plans the perfect murder.

Jack and Edna's pet parrot dies after laying an unusually large egg. On hatching, it reveals an aggressive black-feathered bird.