Crashing at Crashers: A Supervillain Novel

When 10 year old Felix is dropped off at his reclusive old rich uncle's house, he doesn't expect anything more than boredom until his mom comes back to pick him up. However, when he looks around in the mansion more, he begins to suspect that his uncle is hiding a secret. Is his uncle legendary supervillain Gatecrasher, or is everything just a series of coincidences?