Ember Tor and the Water Voles of Merryhill River

At first glance, the Merryhill River looks like a quiet place to be...but look a little harder...

Two families of water vole live along the riverbank. They lived next to each other quite happily for many years until humans shattered their world by building a wall along part of the bank. Some of the water voles were forced to move into the territory of their neighbours and the battle for food and space began.

Ember Tor and Barley rush to help the water voles, but:

Can they come up with a plan to help them in time?
Will the warring families ever find peace again?
Will the voles escape from a terrifying intruder who threatens the safety of the entire colony?

Ember finds out that the sleepy riverbank is not so peaceful after all!