The Ghost Finders are in deep trouble — but is teaming up with their evil ghost-busting rivals at the Crowley Institute really the answer?

The North Sea is bitterly cold, grey and unfriendly... and it's also home to a major threat to humanity. The interdimensional entity known as the Flesh Undying, a monstrous being of unimaginable power, is way out of the Ghost Finders' league, so JC Chance, Melody Chambers and Happy Jack Palmer have no choice but to accept an alliance with their evil counterpart, Project Crowley.

What they don't yet know is that the creature lurking in the seabed has already turned its eye upon the Ghost Finders — and dispatched an assassin with a deadly vendetta against them . . .

Forces from Beyond is the sixth and final title in New York Times bestselling author Simon R. Green's Ghost Finders series featuring Eddie Drood.