I have a novella coming out from NewCon Press in January next year, The Martian Simulacra: A Sherlock Holmes Mystery. It features the detective himself, Dr Watson, and Professor Challenger, and their adventures on the Red Planet of H.G. Wells’s War of the Worlds.
The other novellas in the quartet are: The Martian Job by Jaine Fenn, due out in December. Phosphorous by Liz Williams, out in February, and in March, The Greatest Story Ever Told by Una McCormack. The artwork is by the brilliant Jim Burns, and the spread below displays the covers of all four novellas.