The Iron Fin (Elemental Web Chronicles #3) by Anne Renwick

About

Off the windswept shores of Scotland, healer Isa McQuiston confronts a series of brutal attacks that defy medicine—men washed ashore drained of blood, wounds marked by unnatural tentacles. Forced into alliance with Dr. Alec McCullough, a wounded naval officer investigating the same mystery, Isa uncovers bio-mechanical creatures engineered to kill and a conspiracy reaching far beyond her isolated community. A fast-paced steampunk and gaslamp Victorian fantasy romance blending medical mystery, maritime danger, and high-spice attraction.