Louise Fazenda and Ed Kennedy rob a bank by means of a vacuum cleaner. They operate through the rooms of Charles Murray and Slim Summerville, a pair of dime novel detectives living over the bank. The robbers chloroform the would-be detectives and gain entrance to the cashier's room by means of a ventilator shaft. By means of the hose quantities of paper money are shot up to the detectives' rooms and gathered together in a grip. The cashier has been fooled by Kennedy, who posed as a plumber to get entrance to the money room and then hit the official on the head. A bank policeman gives the alarm, but the robbers escape. Police are summoned and in their researches find the robbery was pulled off through the ventilator and by means of the dime novel men's rooms. The amateurs, however, are gone in disguise to the hotel rooms where the robbers have fled. Murray is disguised as a woman and Summerville contents himself with false whiskers. Murray enters into Kennedy's rooms and gets the robber's loot by an exchange of grips. Kennedy finds a grip containing woman's apparel and fights with Louise. Then he finds Kennedy carrying his grip and takes it away by force. Summerville calls the police. They chase the robbers over the roof. It gives away under their feet and they fall through three stories. Cashier Trask is in his glory and knocks 'em cold with an axe and exits with his coin.