Spike, Joe and Matt are playing their usual ballgame when they find the deserted house. The gate is rusty, the grass is overgrown, there is a half-built extension, and an old Land Rover is abandoned in the garden. The boys are intrigued and, over time, start to explore the rooms inside. But the more time they spend there, the more mysterious they find it, and their exploration of the house eventually leads them into danger. What is the secret of this mystery house, and why did its owners leave it like this?