The suspicious scarf

Hannah Plum and Patti Woo are staying in a creepy, rundown chalet in the Shadow Mountains National Park, where Patti's aunt Unjoo works as a ranger. The girls' parents are keen to spot an ice owl there, but soon, they're all out looking for Unjoo's stolen dog instead. The only clue is a bit of silver wool on a kennel, and Plum and Woo sense the markings of a crime. With rumours of a terrifying silver wolf snapping at their heels, the girls invest...