A boxer is killed in the ring, and the only clue is a tune that a man was whistling.

A private detective, soon to enlist in the army, is drawn into one final case when his police officer father is killed in the line of duty. Soon his prime suspect is murdered as well, and he finds himself framed for the crime. As more witnesses get murdered, he finds himself on the run from both the police and former Prohibition violators who seem to have found a new racket.

The Falcon is framed for the murder of a banker and the theft of war bonds. He makes his escape into the mountains where he hides out in a rustic lodge. From here he uncovers a phony war bond operation.

Hugh “Bulldog” Drummond is on the precipice of matrimony to his beloved Phyllis -- but a bank robbery and a daring escape is going to get in their way before they reach the altar.

Drummond's wedding with Phyllis is interrupted when the inspector guarding their gifts is killed. He tries to trace the killers and uncovers the mystery of diamond counterfeiters.