The fourteenth novel in the magical alternate history Elemental Masters series continues the reimagined adventures of Sherlock Holmes in a richly-detailed alternate 20th-century England.

While Sherlock is still officially dead, John and Mary Watson, Nan Killian, and Sarah Lyon-White are taking up some of his case-load—and some work for Lord Alderscroft, the Wizard of London.

Lord Alderscroft asks them to go to Dartmoor to track down a rumor of evil magic. Not more than four hours later, a poor Dartmoor cottager arrives seeking their help. His wife, in a fit of rage over the children spilling and spoiling their only food for dinner that night, sent them out on the moors to forage for something to eat. The children are moor-wise and unlikely to get into difficulties, but this time they did not come back, and their tracks abruptly stopped. The man begs them to come help.

They would say no, but there's the assignment for Alderscroft. Why not kill two birds with one stone? But the deadly bogs are not the only mires on Dartmoor. And these are not the only missing children.