Rollo, a young troll from Bonespittle, wants to help build a bridge across the Great Chasm to the Bonny Woods, but he must face his fear of the terrible creatures that he has always been told live there.
Seventeen-year-old Valerie Russell runs away to New York City and befriends a group of very unusual characters who live in the city's subway tunnels and soon finds herself bound into service by a troll named Ravus.