It sounds like you might be looking for digital copies of books by (often found in archive formats like .rar ). V.E. Schwab is a #1 New York Times bestselling author known for her "Villains" series and "Shades of Magic" universe.
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If you are looking for specific books to read, these are her most acclaimed works: It sounds like you might be looking for
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: An adventure involving parallel versions of London with varying levels of magic.