"Sophie Foster is back in the Lost Cities--but the 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."--dust jacket flap.

"Illusions shatter--and Sophie and her friends face impossible choices--in this astonishing eighth book in the New York Times and USA TODAY bestselling Keeper of the Lost Cities series. Sophie Foster wants answers. But after a lifetime of lies, sometimes the truth is the most dangerous discovery. Even the smallest secret comes with terrifying new responsibilities. And Sophie's not the only one with blank spots in her past, or mysteries surrounding...

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 must uncover the truth about the Lost Cities' insidious past, before it repeats itself and changes reality"--