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Kick In began life as a Willard Mack-written stage play. It's a fairly typical crime drama, in which bad guy Chick (William Courtenay) wants to go straight but the police want to see him behind bars. They harass him, first getting him fired from his job and then accusing him of being in league with his old partner-in-crime, Benny (Robert Clugston). Finally, the crusty old commissioner (John Boyle) lets him go when he finds out that Chick's wife Molly (Mollie King) has just given birth. While there was nothing particularly unique about the plot, its translation to film and the addition of comic moments made it something special. One charming section, apparently added by screenwriter Ouida Bergere, was a humorous prologue in which the characters of Chick and Benny are shown as children growing up into the ways of crime.