More mystery, murder, and adventure on Mars... Mars, 1816. For almost a year, Harriet George has been training to be a spy in the British-Martian Intelligence Service and things are not going well. She has been failing in tasks she knows she ought to be able to achieve. Now she has been given her first assignment, and Harriet knows that if she doesn’t succeed, it will also be her last. Together with her brother-in-law, Bertrand, Harriet has been sent to Louros underwater hotel to retrieve a package from an informant. It’s supposed to be a straightforward task, but everything goes terribly wrong. If Harriet can’t figure out who is working against her, not only will she lose her job, she may not make it back to the surface alive.