Enchanted unicorn horns, pirate prawns, dangerous mega sea creatures, and MORE await Quinnelope and friends as they embark on an iridescent island adventure to prove unicorns are really real in the third hilarious volume from comic duo Kayla Coombs and HF Brownfield! It's Quinnelope's favorite day of the year: Rainbow Day! Everyone in Pleasant Towne is celebrating with all things multicolored, including a technicolor parade. But Quinnelope's prismatic party plans screEeEeEEECH to a halt when she's told unicorns aren't real. Oh dear! It's a Rainbow Day IMAGINASTROPHE! ("Imagination catastrophe," as Quinnelope would say.) Devastated by this discovery, Quinnelope is joined by her friends Star and Bub on a quest to Unicorn Island, a dazzling destination that will surely be home to a real unicorn . . . right?!