What could possibly go wrong during a weekend in the countryside with an art collection to look at? Everything, when a Van Gogh disappears.

When her most treasured painting mysteriously vanishes from the hallway wall of Matt’s grandmother, her only hope to catch the thief is Project Adventure, the kid-detective agency.

Ethan, Matt, and Lisa embark on a train journey to the small town where Mrs. Sharkey—Matt’s grandmother—curates her beautiful estate and valuable art collection. Caught in a terrible storm that sets the garage ablaze and almost kills them, Ethan, Matt, and Lisa discover a secret door and other clues that bring them closer to solving the mystery. Will the Van Gogh be restored to its rightful owner or be lost forever?