All Systems Red by Martha Wells

"As a heartless killing machine, I was a complete failure."

In a corporate-dominated space-faring future, planetary missions must be approved and supplied by the Company. For their own safety, exploratory teams are accompanied by Company-supplied security androids. But in a society where contracts are awarded to the lowest bidder, safety isn’t a primary concern.

On a distant planet, a team of scientists is conducting surface tests, shadowed by their Company-supplied ‘droid--a self-aware SecUnit that has hacked its own governor module and refers to itself (though never out loud) as “Murderbot.” Scornful of humans, Murderbot wants is to be left alone long enough to figure out who it is, but when a neighboring mission goes dark, it's up to the scientists and Murderbot to get to the truth.