The twins lead a midnight expedition from Miss Beardsley's into the woods to revel in a moonlight picnic. One of the professors sees them vanishing thither, carrying a big basket. In dressing gown and slippers he gives chase. The old, near-sighted professor loses one of his slippers and cuts his foot on his broken glasses. Discovering his plight, the girls take pity on him. They try to overtake him. Meanwhile, the professor comes upon a deserted house. He mistakes two figures on the porch for the runaway twins. One of them takes to the woods. The other darts indoors, followed by the professor When the twins reach the place they discover under a window a bag of loot, and on the sill a bloody footprint. Realizing that burglars have got the professor, and feeling that they are to blame, Marian and Madeline bravely enter the house. Then is enacted a thrilling drama, in which the rest of the picnic party fortunately arrives to reinforce the twins, and by the time the police arrives the burglars are found suffocating under an avalanche of girls. At Christmas time, going home on the train, the twins see their burglars again. They are marched on board by two deputies, taking them to state prison, and one of the crooks attempts to attack Marion and Madeline. The other one, however, seems so sincerely contrite, that the twins induce the deputy to loosen the shackle about his wrist. The train is wrecked. The two deputies and one of the burglars are killed. But the twins are saved. They conceal the identity of the other burglar from inquisitive reporters and take him home. Their father gives the man a chance on his estate. The governor is prevailed upon to pardon the former crook. Today he is the twins' father's chauffeur.