An unexpected inheritance gives Greg Heffley’s family a chance to make big changes to their house. But they soon find that home improvement isn’t all it’s cracked up to be.

Once the walls come down, all sorts of problems start to crop up. Rotten wood, toxic mold, unwelcome critters, and something even more sinister all make Greg and his family wonder if the renovations are worth the trouble. When the dust finally settles, will the Heffleys be able to stay . . . or will they need to get out of town?