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.

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. 

David Michael Slater is an acclaimed author of books for children, teens, and adults. His work for children includes the picture books Cheese Louise!, The Bored Book, and The Boy & the Book, as well as the on-going teen fantasy series, Forbidden Books, which is being developed for film by a former producer of The Lion King. David's work for adults includes the hilarious comic-drama, Fun & Games, which the New York Journal of Books writes "works brilliantly." David teaches in Reno, Nevada, where he lives with his wife and son. You can learn more about David and his work at www.davidmichaelslater.com.

Mauro Sorghienti grew up in Porto San Giorgio, a charming Italian town on the Adriatic coast, where he found inspirations reading old fantasy stories and ancient myths from northern Europe. Not far from there, is the State Institute of Art where he learned the basics of his craft before changing paths and graduating as a Childhood Communities Assistant. However, the graphic arts were always his main passion and soon he was able to make that his main occupation. He has gained twenty years of experience in illustration and cartooning, playing creative roles for many projects from the earliest stages of their development on to completion. He loves drawing, painting, and when he is in the mood, also modeling odd tangible things. Sometimes, he also has a bit of free time to spend on his hobby as a board games enthusiast!