Books Under a dark sky

The novel is a mystery/thriller about a woman named Eden Wallace, whose life is in disarray after her husband's death. To cope, she goes on a getaway to a dark sky park, only to find the guest suite she booked is not private but is occupied by a group of old college friends. When one of the friends is murdered, Eden finds herself a suspect in a "locked-room" style mystery. She must uncover the truth and evade the killer before nightfall.