A Mystery of Wolves — Isobelle Carmody

Little Fur goes in search of her friend, Ginger the cat, who has vanished completely in this third book in the Little Fur quartet. The wise Sett Owl tells Little Fur that she must first discover who or what the Mystery of Wolves is. The only creature Little Fur finds who has heard of them is a mad prophet. He explains that the Mystery of Wolves is a mystic order of wolves who dwell in the high mountains to the east of the city.
On an adventure that leads to more than just Ginger, Little Fur learns more
about her long-gone father and mother and ultimately risks everything she
loves to save the mysterious and dangerous humans who do not even
know she exists.