Books in the The International Yeti Collective series

When a young mountain yeti called Tick reveals the existence of his tribe to a group of human explorers, the entire yeti civilisation is thrown into danger. Will he manage to protect his yeti companions before the humans destroy everything?

The precious water at Shadowspring is running dry but Tadpole and the other yeti don't know why. Could it be that Henry, a human boy, holds the answers they're searching for?