The Wish List by Eoin Colfer

Meg Finn is accidentally killed by her partner-in-crime during a burglary. Her last-minute act of kindness rescues her from being sent through the tunnel directly to hell. After winding up in limbo instead, the girl’s spirit returns to earth in the hope of eventually going through “the Pearlies.”

To make the heavenly cut, Meg goes to the aid of the elderly Lowrie McCall 68, a depressed down-and-out bloke who has four wishes on his list before he dies. But demon Beelzebub wants her soul, too, and he’s sent a “Soul Man” — a vicious dog-boy who murdered her — to retrieve it.