You'd think a ghost grandad would be a great sidekick for a wannabe detective. Unfortunately, if there was a 'being a good ghost' exam, Jay’s grandad would fail spectacularly – he hates walking through walls, he can't touch anything and he's rubbish at haunting. Since his dad literally did a vanishing act (he's a magician), Jay Patel has turned detective, and now, with the help of his granddad, he’s on the case of a dead body that vanished from the library of his Glasgow primary school. But what do diamonds, blackmail and dodgy launderettes have to do with it?