After being released from prison, Calvin is already on his next heist with the help of his dimwitted partner in crime, Percy P. Calvin steals a valuable diamond from a jewelry store without anyone noticing at first. The cops were eventually able to catch on, and during the hot pursuit, Calvin is forced to dispose the diamond in the purse of local woman, Vanessa and her husband, Daryl.
Calvin and Percy follow the couple to their home, and overhear that the couple wish for a baby. This gives Percy an idea to disguise Calvin as an abandoned baby so he can get into the house and retrieve the diamond.
What starts as a simple in and out job quickly turns more complicated when Calvin finds the young couple actually falling for him, and welcoming him into their lives. He even finds himself slowly getting used to the loving family life that he never had. However, danger is lurking nearby, as Calvin's boss, Mr. Walken, who instructed him to get the diamond in the first place, is starting to grow impatient. If Calvin doesn't retrieve the diamond soon without blowing his disguise, the family may be in danger.
Soon after Calvin finally gets the diamond, he calls Percy to pick him up. Percy tells Calvin that Walken and his goons are going over to Daryl's house to retrieve the diamond for themselves. Calvin tells him that Walken would kill Daryl if he doesn't the diamond, which was actually part of his plan to protect Calvin and himself. This leads Calvin to push Percy out of the car and drive back to Daryl's house to save him and have Walken arrested.
Daryl is given an reward for the return of the diamond, and since Calvin saved his life, he doesn't turn him over to the cops. Before he leaves, Calvin thanks Daryl for taking care of him even though he wasn't really a baby and admits that he thinks Daryl would make a great father someday. Calvin was about to be out of Daryl's life for good, as Daryl watches him leave, Calvin is crying hysterically about his miserable life, so Daryl decides to let Calvin stay and from that point on, the two men became best friends.