Age range 8 to 12 Ruby and the members of her lunchtime book club are thrilled when the class field trip to the museum gives them the chance to follow in the footsteps of an adventurer who may have discovered the last unicorn. The third book in this fun series that's perfect for younger fans of the Dork Diaries and Story Thieves series. Ruby Starr is an older Junie B. Jones with a big imagination and a love of reading. Ruby Starr is feeling fabulous after helping save her school's library and creating the world's first (and best) pickle cupcake. And she's feeling extra stupendous when she's assigned a book report and finds the most perfect, meant-to-be book ever -- one about unicorns! But when her bestie is not acting like herself, and a class field trip to a museum doesn't go the way Ruby imagines, Ruby's not sure she'll get the perfect end to the year she was hoping for.