Synopsis

The Mattigan kids don't believe in things that go bump in the night. After all their dad is famous for proving such things are impossible. But when their long-lost Grandpa Joe shows up with his Mysterious Monsters journal begging for help the siblings find themselves drawn into a search for Bigfoot Aliens Vampires Ghosts Werewolves and more. Along the way they'll have to deal with meddling babysitters suspicious psychics a YouTube disaster and their furious father. To solve this mystery Maddie Max and Theo must rethink what's possible—and make lots of peanut butter and banana sandwiches.

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