Underwater mysteries, murder, and mosasaurs, with a fabulous girl-spy heroine.

Mars, 1816. For almost a year, Harriet George has been training to be a spy in the British-Martian Intelligence Service, but it has not been going well. Now she has been given her first real assignment, and Harriet knows that if she doesn't succeed, it will also be her last.

Together with her hapless brother-in-law, Bertrand, Harriet has been sent to Louros underwater hotel to retrieve a package from an informant. But when a footman is murdered, Harriet's mission is thrown into chaos. If she can't figure out who is behind the murder, not only will she fail her mission and lose her job, she may not make it back to the surface alive.

A Spy in the Deep is Harriet George's second adventure, full of mystery, action, and humour. Join Harriet and Bertrand as they try to unweave another tangled mystery on Regency Mars.

"This story reminded me somehow of Gail Carriger's Parasol Protectorate, but with a more serious bent to it and a charming heroine I would like to encounter again in other stories."
- Speculative Herald

"This story had the cozy feel of a drawing-room mystery, but add in dinosaurs on Mars, robots, clockwork trains and more and you have one crazy and unique story."
- Books, Bones & Buffy