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. 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!