The Phantom of the Marshes

After their eventful outing at Foxfire Manor, Jem Bishop and his brother Hal have returned to London in hopes of making progress on their on their own mystery: their father's death. But they are getting nowhere, until a letter arrives from Andrew Marsh, the son of the industrialist who manufactures the aether-engines their father became famous for. The letter describes a terrible curse - and soon Jem and Hal are on their way to Birmingham on the trail of another case. But as the death toll rises and the connection to their father's work becomes clear, Hal and Jem find themselves on the wrong side of the law - and the spirits.