The series was originally projected to conclude with an as yet untitled book 10, but Shannon Messenger has since said she is not sure if a book 11 will be required. The ninth book, the most recent installment, was released on November 8, 2022. The story has continued over ten books as of November 2022, with one book released each year, as well as Unlocked (book 8.5) and four short stories in limited editions. The Keeper of the Lost Cities fandom mostly supports 'Sokeefe', the romantic paring of Sophie and Keefe while others support 'Sofitz', or 'Fitzphie' Sophie is torn between Fitzroy Vacker and Keefe Sencen, both her friends and past or current boyfriend. The main antagonist group of the series is the Neverseen, an extreme criminal organization at odds with the Black Swan. They aim to shift the oligarchy under which the Lost Cities operate, with a central Council at its head. She eventually discovers that she has dangerous and illegal secrets hidden in her mind, planted there by the Black Swan, a rebel group who is later revealed to have planted Sophie in the human world. She starts school at Foxfire, the school for Elvin nobility. She is forced to leave her human family behind and stay with an Elvin couple, Grady and Edaline Ruewen, who later adopt her. He tells her that she is an elf, a race with dozens of genetic-based 'special abilities' (her telepathy among them), and she must move to the Lost Cities, a hidden civilization where elves and other fantasy races live.

She lives in San Diego, California until a teenager with the same power, Fitz Vacker, contacts her. The series tells the story of Sophie Foster, a twelve-year-old high school senior with the ability to read minds. The seventh book in the series, Flashback, had a first printing of 150,000 copies and Shannon Messenger's three-week tour to promote the book drew crowds of 200-700 people per event. The series first charted following the release of the 5th installment, Lodestar, on the week of November 20, 2016. The first book in the series was an Association for Library Service to Children tween recommended read in 2013.

Keeper of the Lost Cities is an upper- middle-grade fantasy series by Shannon Messenger that has appeared on the New York Times bestseller list for a total of ten weeks.

( November 2022) ( Learn how and when to remove this template message) Please clean it up to conform to a higher standard of quality, and to make it neutral in tone. This article may be written from a fan's point of view, rather than a neutral point of view.

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