Since he was six years old, Finnegan Flynt's thieving and mysterious monster-Pi-has lived under his bed. With his twelfth birthday rapidly approaching, Finny begins to wonder if he is too old for a monster. When Pi steals a valuable necklace, the consequences for Finny are disastrous.
Fed up with his monster, he tells her to go away-forever. But Pi doesn't leave voluntarily. She's taken. By the evil Monster Council of Monger.
Determined to fix his mistakes and rescue Pi, Finny and his best friend Tyler embark on a dangerous quest to the dreaded Nullity... the place where monsters live. Monsters that other monsters are afraid of.
As the boys race to save Pi before it's too late, danger closes in. And Finny, faced with his greatest fear, must decide-
What is the value of Pi?