Six Wakes by Mur Lafferty is a closed-room murder mystery in space with clones!
I got hooked on this! As the characters discover their situation, and all the weird things that are going on, I knew that Mur was going to stitch them all together so it made sense by the end–and WHO DID IT?!!?!!
I appreciate that Mur Lafferty is getting better and better with each book. This one is quite good–but it is not perfect. There were maybe three or four times I thought something was hokey or silly–and all but one of those times it was crucial to how the the plot works out, so stick with it. (I think that one of the characters was so good at a skill of hers that it was almost a superpower.)