At age twelve, Sophie learns that the remarkable abilities that have always caused her to stand out identify her as an elf, and after being brought to Eternalia to hone her skills, discovers that she has secrets buried in her memory for which some would kill.

Sophie's talents are getting stronger and, with the elusive Black Swan group ignoring her calls for help, she is determined to find her kidnappers but a daring mistake pushes her world to the edge of war, and soon she has exposed a a major conspiracy that could threaten all she loves.

Sophie Foster is back in the Lost Cities--butthe Lost Cities have changed. The threat of war hangs heavy over her glittering world, and the Neverseen are wreaking havoc. The lines between friend and enemy have blurred, and Sophie is unsure whom to trust. But when she''s warned that the people she loves most will be the next victims, she knows she has to act.

In this stunning ninth book in the New York Times and USA TODAY bestselling Keeper of the Lost Cities series, Sophie and her friends discover the true meaning of power—and evil.
Sophie Foster changed the game.

Now she's facing impossible choices:
When to act.
When to trust.
When to let go.

Her friends are divided and scattered, and the Black Swan wants Sophie to focus on their projects....