'Nostalgic, clever, and joyful to the point of effervescence, The Mash Up is the romance I've been dying for.' -Annabel Monaghan, New York Times bestselling author of It's a Love StoryMANSION * APARTMENT * SHACK * HOUSERuby Wynne is a staunch rule-follower who lives by the numbers. So when a surprising breakup on her thirty-fifth birthday ruins all her well-laid plans, Ruby makes an unexpected wish. The next day she wakes up inside a totally different version of her life, one from the M.A.S.H. game she and her best friend would play in seventh grade to predict their futures.Settled in a Technicolor mansion, driving a tie-dye Jeep, and running a roller-disco restaurant, Ruby is living out her childhood dreams come true - with one exception. According to the game, Ruby's "other half" is supposed to be Penn Hayes, her brother's annoying, and annoyingly handsome, best friend. But there's zero romance between them. Just like in real life, all they share is sarcasm. With no rules to follow and desperate to return to reality, Ruby makes her best guess at an escape plan: win Penn's heart so the game comes completely true and she can go home.It's unthinkable. On Ruby's list of dos and don'ts, Penn Hayes is a lifelong don't. But as Ruby navigates the magical world she dreamed up at thirteen, she wonders if, by finally throwing out her rules, she might just find her way home to the life and love she deserves.