This was a lot of fun. Elliot Harper, his wife Vanessa and their children Gwen and Zach are on vacation at a fancy resort. They have to give up their cell phones before they can access the resort. It's not long before there's an announcement in which it's shared that there are fifteen serial killers and there can only be one survivor. The lone survivor is promised a cash prize. The characters are well-written and I was sad when many of them died. Also while this starts off as a slasher, it goes into some cosmic horror towards the end, which I really enjoyed. I would recommend this to readers who like fast-paced horror.