Charlotte's parents are fighting again. As the oldest of four children, Charlotte needs something to distract her three siblings. June, the youngest, takes a quarter from a bag and drops it in a tree-shaped coin bank. But these are no ordinary quarters. The kids are transported to a new world - one that resembles the scene on the back of the coin.

That world is Nova, and Nova is at war. The four siblings are now thrust into the middle of this war between the witches and the animal warriors. A raccoon named Ringo offers a way home - but the kids must first fight alongside the animals. Younger sister Ava wants to fight. Charlotte doesn't trust the warriors and wants to look for her own way out.

Charlotte and Ava become separated when they each follow their instincts. On their own, each girl discovers mysteries about Nova that place their family in peril. Now Charlotte and Ava have to find one another again - a task wrought with danger and deception - before it's too late.