Livey Ell is the only normal person in a family of math geniuses. From her absentminded professor father to her weirdo little brother Darby, it's a wonder she's as normal as she is. But when Darby's imaginary friend Bob turns out to be very real, Livey's life takes a turn for...
Livey's younger brother, Darby, a math genius, brings his imaginary friend to life through a mathematical proof. Bob is a creature of pure math, and he hates chaos and disorder. Now Livey, Darby, and some very unique allies must band together to find a way to stop Bob--before...