A dying king reveals a secret on his deathbed which has been passed down from king to king. When William finds a book in his mother's attic and accidentally casts a deadly spell on himself, he must find out the secret of the dying king in order to save his life.

It's a race against time as William embarks on another journey to a dangerous historical era. How will he save his life, and what will he do when he finds out Raven is also after what the secret will reveal?

The Chest of Spells is the third adventure in the 'Between the Trees' series.