Lockwood and co book 7

Follows three young operatives of a Psychic Detection Agency as they battle an epidemic of ghosts in London. The Screaming Staircase. Tom Ward and his apprentice Jenny fight against boggarts, witches, and terrifying creatures of the dark. Together with the witch assassin, Grimalkin, they lead an army into battle against a dangerous enemy - but it all goes catastrophically wrong. But Alice had turned to the dark - can Tom trust her now? When Phantoms - beasts made from nightmares and darkness - suddenly appeared, four girls, the Effigies, each gained a unique power to control one of the classical elements: earth, air, fire, and water. Now, with technologies in place to protect the world's major cities from Phantom attacks, the Effigies have become international celebrities, their feats televised and talked about in online fandoms.