Cyril Phelps is the black sheep of his family; the one Phelps child who didn't go to college, doesn't have a fancy job with a six-figure salary, and no perfect spouse and kids. As a result, he's always been the butt of all the family jokes. But, what Cyril does have is the inside scoop on the family's dirtiest secrets. And when his siblings go too far with their bullying at the Phelps family Christmas gathering, what starts out as a good day, turns into Mad Day - the day when Cyril strikes back, and no one will walk away unscathed. Hell hath no fury like a sibling scorned.