When Cayleigh Wilson, 17, loses her mother in a tragic boating accident, the excitement of her senior year of high school is shattered. But when her deceased mother’s hip and beautiful distant cousin, Sienna Markle, 40, moves in with Cayleigh and her father, Tony, 40, things start looking up. Sienna gets Cayleigh excited about life again…especially her senior prom…the biggest high school event!! Sienna will stop at nothing to make it a perfect night for her young cousin…including murder.