Rivalry and Steam Monsters by A. F. Stewart

Dark alchemy is afoot in London!

Amidst declining business and a tarnished reputation, Heyward and Andersen eagerly welcome their new client, even if he is spinning tales of strange creatures in the Thames. Initial inquiries uncover suspicious behaviour at Markham Laboratory, a forbidding location that discourages visitors.

Additional investigation leads them into the world of alchemists, Eldritch gods, and a thrilling finale full of mayhem and magic. It's Heyward and Andersen vs. monsters, human and otherwise, with the fate of London and the world at stake!

Set in a world of airships, mysteries, and the supernatural, Rivalry and Steam Monsters, is the fourth story in the Heyward and Andersen, Consulting Detectives series.