«You're Next» by Gregg Hurwitz

Mike doesn’t recognise the crippled stranger who approaches him at a party… but the stranger seems to know all about him. Overnight, threats become attacks, and Mike, his wife, and their young daughter learn they aren’t safe anywhere - especially not their own home. He doesn’t know who they are. He doesn’t know what they want. But there’s no time to figure it out - because his enemies have killed before, and he’s next.