Using a unique form of persuasion - singing toads - Theo's rude and surly dead grandma has somehow coerced him into tracking down one of her ghostly friends' pelvic bones.

That sounds tricky and weird enough, but then Theo discovers the pelvis is handily located at the bottom of a fish tank full of piranhas in the office of none other than Josiah Jellicon - only the most powerful man in town...Theo's going to need help - but he didn't expect it to come from a grumpy Kelly-Osborne lookalike called Alix: the girl from LIMBO...