Spring in Marrowdell is a time to celebrate. Life stirs, the air warms, and Jenn Nalynn and Bannan Larmensu couldn't be happier. But spring is also fraught with change, and nowhere is this truer than the edge, where the Verge, the magical realm of dragons and sei, touches that of snow and roads. The spring equinox marks the final turn before Marrowdell's sun starts to dominate the sky and Jenn, turn-born and sei, feels the pull to cross to the Verge.

Marrowdell's river floods, and Jenn knows she is needed at home, but deep within the Verge a perilous force is calling her away from all she loves. For the house toad's mighty queen has waited for the first equinox with the powers of a turn-born in the edge, and now she is ready to make her move against it.

Caught up in plots they cannot understand, Jenn and Bannan find themselves separated, and to reunite they will have to outsmart the queen herself. But even if they can foil her plan, will Marrowdell still be there when they return?