Welcome to Moon Hollow, where mystery lurks around every corner--and four kids have come together to solve crimes and puzzles big and small. Whether they're thwarting thieves, revealing the truth behind a strange sea monster, or solving the haunted mystery of a basement's spooky sounds, Viola, Sylvester, Rosie, and Woodrow will figure out the truth in six clues or less. And readers are invited to guess alongside them each step of the way.