Death Bringer (Skulduggery Pleasant Book 6), Derek Landy

He’s dead. She’s deadly. The bad guys don’t stand a chance.

The sixth book in the bestselling Skulduggery Pleasant series. The Death Bringer has risen. Skulduggery and Valkyrie have seven days to uncover the Necromancers’ secret before it’s too late.

The clock is ticking. Lord Ville is loose. And after this one, nothing will ever be the same again.