Henry is the new boy at Halbrook Hall - a crumbling boarding school in the Scottish Highlands. He thinks the rumours of yeti lurking in the misty hills are nothing more than stories. Until one day he gets lost in the forest…

As a young yeti, Tadpole loves living in Shadowspring. But now the precious spring water is disappearing and no one knows why. The situation is serious - surely there’s something she can do to help…

When Tadpole accidentally reveals the top-secret location of Shadowspring to Henry, the lost boy she saves, she knows she’s in deep trouble. But what if this human actually has the power to help the yeti not harm them?