When Elise returned from her last visit to Yetzirah, a magical world she and her sister discovered as children, she found that a butterfly came back with her. But this is no ordinary butterfly. Crafted of silver wire and sapphires by one of the pocket wizards, it should not have been able to cross the barrier and it should not have been able to fly in a world without magic, yet it has done both of these things.

This and other strange events convince Elise that the barrier is growing weak, threatening the existence of both worlds. To find a solution Elise must enlist the help of her twin sister. But will Elena help save a world in which she no longer believes?