Working backwards, the previous volumes were...
Exploratory anthology Ill-Considered Expeditions, which featured my tale of misinformed steampunk explorers encountering horror in the heart of Africa, The White Goddess.
Giant monster homage Stomping Grounds, which featured my tale of radioactive Welsh lake-based horror Avanc.
Rampage-themed anthology, Amok!, which featured my tale of porcine laboratory rampage, Emperor of Swine.
All four volumes can be ordered through Amazon.