Actor Jack Holden lives a hedonistic life along with his roommates Peter and Michael in New York City. But everything changes when a baby is left on their doorstep with a note saying that "Mary" is Jack's child, the product of a fling with a recent co-star. Jack is away on a shoot when the infant arrives and Peter and Michael do their best to take care of her. When two men arrive asking for "the package" they assume that they mean the baby, but soon find that they are drug dealers looking for heroin, and get rid of them by giving them some powdered milk. When Jack when returns, he also rises to the occasion and soon loves his baby daughter. The drug dealers eventually return looking for the heroin and the roommates successfully trap them and have them arrested. Eventually Mary's mother Sylvia arrives, wanting to take Mary back to England with her. The agree, but after giving it some thought, the three men realize they cannot stand losing their little charge and rush to the airport to stop her, but Sylvia is gone. Happily for everyone, when they return home, they find Mary with Sylvia, who has decided that she does not want to raise the child alone and the men invite her to move in with them.