When Roscoe has to go out of town on business, he leaves Mabel alone at home. She is terrorized by what she iamgines to be roving gangs of murderous foreigners, like organ grinder Glen Cavender. Like many a Keystone of this era, this is a burlesque of other movie themes. Also like many of them, it burlesqued the works of D. W. Griffith, who had followed Biograph's policy of making films about the evil foreigners who threaten good American women -- almost invariably played, it seems, by Joseph Graybill. The rest of it -- the woman at peril cowering behind a door, while family and police race to the scene -- was also a staple at Biograph, and the core of the editing techniques that Griffith -- had been a staple of Keystone farces at least since THE BANGVILLE POLICE had introduced the Keystone Kops. They show up here too. Although there's a certain realism about this -- Mabel drives herself to distraction through neurotic imagination -- that wasn't often at play in Keystones, there's a clear line of succession here; this seems to be based most securely on WON IN A CLOSET, which in turn seems to derive from the Giish sisters' 1912 movie debut AN UNSEEN ENEMY. I'm sure, if you look, you can find other movies in its structure.