Kin

Suggestions:

Reich of the Dead Frankenstein\s Army Dead Walkers: Rise of the 4th Reich The Hand Iron Wolf

A group of all female friends travel to a hotel owned by one of their families, and do not invite their boyfriends due to wanting to have an all girls weekend. In return, the boys plan a prank on the girls - but things take a sinister turn as the friends begin to reveal hidden sides.