When eleven-year-old Felix's family inherits an old mansion and moves without warning, it doesn't take long to figure out there's a ghost living in the basement. But Papa Joe is no typical ghost. He's—well—nice. He's also been stuck in the basement since the 1800s, housebound by the rules of the Ghost Protocol Book. He's desperate to escape and it looks like the new kid in town is his only hope.

But Felix doesn't stand a chance of helping Papa Joe without the help of his new friend Squeak, and an Irish Wolfhound named Honest Abe. Together, this accidental ghost squad will brave dark woods, dusty basements, and snooping parents to get to the bottom of this ghostly mystery.