See what perils await this beloved blue-haired adventurer in the sixth book of Luke Pearson's widely praised series.

The newest book in the beloved Hilda series continues the action-packed adventures with Hilda stuck in the body of a troll trying to save all of human and troll-kind. Her mother is worried sick, and is perplexed by the strange creature that seems to have taken Hilda's place. Now, both of them are in a race to be reunited before Ahlberg and his safety patrol get the chance to use their new secret weapon to lay waste to the trolls, and Hilda along with them.