"Lisa's nephew Darby is having trouble at school. Sid agrees to let Darby come stay with him and Lisa, not realizing that his own life is about to be turned upside-down. An old friend comes by the house with a boy about Darby's age who looks remarkably like Sid. Rachel never told Sid that she was pregnant, but now it's time for Nick to know where he came from. Lisa suddenly finds her hands full trying to get Sid to acknowledge Nick, figure out what Darby's problem is and working undercover to set up a sting on a group of defense plant employees who are selling secrets."