The Martian by Andy Weir
Outstanding thriller about a man left behind on a Mars mission. Almost all of the tension is sucked out by geeky humor but the leftovers are more than enough. The movie version will probably switch the geek out and install Sandra Bullock.
Personal (Jack Reacher, #19) by Lee Child
If you're a Reacher fan this is a solid installment, by the numbers. If not then don't start here.