A night celebrating Bart Whitaker's college graduation ends in horror when a gunman attacks him and his family, killing his mother, Tricia, and brother Kevin; as police try to unravel the tragedy, they uncover family secrets and a surprising suspect.

Bud and Melanie Billings lovingly adopt a houseful of special-needs kids; when a home robbery ends in Bud and Melanie's murders, police look for clues in the couple's home security camera system and find video that is both horrific and heartbreaking.