Castine, Then There Were Two - Part 3 begins right where Castine, Reflection - Part 2 left off. Castine is still under the growing threat of the Maraudulv whose return to Castine still mystifies them all. As they begin to make plans and take precautions, Alison and her family continue to train harder than ever. Exploring and pushing their abilities to their limits. Some of them find out exactly where their limits end and the consequences for pushing too far.

Alison's and Phaelan's relationship continues to heat up. Their feelings for each other only grow stronger with each passing day. Yet both are determined to keep the promise they've made to each other, but can they keep their word? With time running out, it's getting harder and harder to stay committed to such a virtuous promise.

The questions still remain. How will Alison and her family help Castine defeat their enemies? Will they ever find their way home? And if Alison gets home, will she ever see Phaelan again?