“The Bachelorette Party” (*1/2 out of four) was a glossy but empty melodrama about a bachelorette party that turns deadly when secrets and a series of duplicitous and cruel intentions start to reveal themselves and everyone has to wonder who to trust. Promising beginning soon goes nowhere as character motivations are murky and film gradually sags. Film doesn’t so much end as stop but you’ll likely have given up by then anyway.