This gripping locked-room mystery sees Joseph Spector investigate his most sinister case yet: murderous machinations at a haunted manor house. A former First World War field hospital, the spooky old mansion at Devil's Neck attracts spirit-seekers from far and wide. Illusionist-turned-sleuth Joseph Spector knows the house of old.

With stories spreading of a phantom soldier making mischief, he joins a party of visitors in search of the truth. But the house, located on a lonely causeway, is quickly cut off by floods. The stranded visitors are soon being killed off one by one.

With old ally Inspector Flint working on a complex case that has links to Spector's investigation, the two men must connect the dots before Devil's Neck claims Spector himself as its next victim.