A petty thief''s plan to reform is jeopardized when he''s locked in a department store during Christmas.

Dandy Forsdyke, a petty thief who is unable to control his "itchy fingers," is the despair of his fiancée, Babette La Verne, a stripteaser. Babette's friend Carol suggests that Dandy enlist in "Crooks Anonymous," a society for reforming criminals headed by Senior Brother Montague, an ex-convict. After surviving several grueling tests administered by Montague's tough assistant, Brother Widdowes, Forsdyke is pronounced cured. He graduates to an honest job as a Santa Claus in a London department store, but when accidentally locked in the store at night with the Christmas receipts of £250,000, he places an emergency phone call to "Crooks Anonymous" to rescue him from temptation. Montague and the organization arrive in force, but they succumb to the lure of the untraceable bills and steal the money. Babette, informed of their adventure, threatens to expose the crooks unless they return the money. After the hazardous replacement of the money is accomplished, Babette marries Dandy and becomes an honorary member of the reform group.