GRAVITY by Tess Gerritsen. That wasn't bad – probably more surprising for her regular medico-thriller readers than an SF reader, but it did necely genre-straddle, being legitimately hard SF as well as a medical thriller thing (which isn't my general reading material, and less likely to become so these days).
There was some predictability in there, and characterisation not so great – I didn't really get an image or voice for anyone – and the use of Chekhov's Gun was frequent and obvious from the get go. OTOH, the plot, moved along nice and smoothly, even if I found myself skimming the bits where the estranged couple each don't want to get divorced but everything they say makes the other think that they do want it.
As an aside, no, this has nothing whatsoever to do with the film Gravity, bar the title and the ISS. Overall... It was OK. I dunno that I'd look out for other Gerritsen books generally, but I'd read a sequel to this if there was one.