Fresh from their hair-raising adventures in The Mystery of the Moon Tower, Kyle, Vic, Beth, Harry, and Nate are now hot on the trail of something big! A secret staircase leads down into the unknown, setting them on an exciting chase for clues left by the wealthy explorer Henry Merriweather, who was rumored to have hidden away a priceless treasure. Are the legends real? Where will the five friends end up? And what dangers will they encounter along the way? Because as they've come to learn, everything comes at a price...

In this exciting graphic novel adventure series, richly illustrated by Eisner-award-winning artist Steve Hamaker, the Pathfinders go ever deeper into the labyrinthian Merriweather mystery--and hope they'll come out the other side!

"A legendary hidden treasure, a guy who collects stuff in a mysterious castle, and five cool kids trying to connect the dots and save the day. What's not to love here?"
--Max Brallier, author of the Last Kids on Earth series