It's the ultimate haunted house challenge. A crumbling stone mansion nestled in the Gothic Quarter of Barcelona, it may be the best-kept secret in Europe—a little-known attraction featuring nine escape rooms to explore, nine puzzles to solve, and a large cash prize for anyone who makes it to the end. There's just one catch: no one makes it to the end of The No-End House. . . .

When Joe Hadfield hears about the house from a pair of backpackers, he's intrigued but not interested. He's trying to escape a nightmare of his own: the trauma of witnessing his wife's grisly death. Traveling the world to ease his pain and grief, he meets a beautiful stranger named Helen who convinces him to try The No-End House challenge together. Joe reluctantly agrees. But as soon as they enter its walls, meet its mysterious host—and sign an ominous contract—Joe begins to understand the seductive power of The No-End House . . .

It knows his darkest secrets. It feeds his greatest fears. It makes him do things he would never do. And there is no end to what he will do . . . to make it out alive.