The eighteenth volume in Dana Simpson's bestselling comics series flips the script when Phoebe magically transforms into a unicorn--and quickly discovers that life with hooves and a horn is far more complicated (and hilarious) than she ever imagined.

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When Phoebe gets the chance to trade places with Marigold Heavenly Nostrils, she leaps at the opportunity. Being a unicorn for a day sounds like the ultimate dream--sparkle, glamour, and magic at your command. But Phoebe soon learns that trotting in Marigold's hooves comes with challenges she didn't expect, from figuring out how to properly use a horn to handling the constant admiration (and occasional jealousy) of others.