Myf, Michael, Jeff and Ross were conceived in the 1970s using anonymous donor sperm. All four grew up thinking their dad was the man who raised them, only to discover in adulthood that they were donor-conceived. Sharing a desire to uncover the truth about their donor father and their genetic heritage, their search for answers is hampered by old promises to donors that they would remain anonymous. Faced with this obstacle, they are inventive in their efforts to find out what they can, and searching yields some very surprising results.