Footsteps in the Fog: The Harding Hall Mysteries, Book 2 (Unabridged‪)‬

Footsteps in the Fog is the second book in the Harding Hall mystery series.

Lars, it seems, now has the brawn, brains, and bravery (as well as the money) to do anything he wants, so he decides to open a detective agency in London. While chasing miscreants and cheating husbands, he soon finds himself entangled inside the web of Germany's most dangerous spy.