Getting Even with Dad plot
"..He's not getting mad, he's Getting Even With Dad."
An ex-prisoner, now a cake decorator, and his buddies plot the robbery of a coin collection. During the planning, his son suddenly shows up at the door. He has lived with his sister all those years, but the sister wants to let him live with his father again temporarily as she is going on a honeymoon. Dad then gives in and lets his son stay with him. He and his comrades think that the boy is not aware of the robbery plans after all; but they are wrong. In fact, the kid has his own ideas about it.