All aboard the Owl Express! Nate, the great detective, and his dog, Sludge, hit the rails on their latest case. Their mission: to guard an owl named Hoot. Hoot belongs to Nate's cousin Olivia Sharp, and she thinks someone on the train might be out to get her feathered pet. But whooo?Sludge keeps an eye on the owl's cage while Nate snoops for clues. Then Hoot disappears! With many suspects to question and many places to look, Nate knows one thing for Sure being the bodyguard of a little bird is a lot more work than he ever imagined!As the train races toward its finalstop, can Nate sort out the mystery of the vanishing owl?