The Pawns of Havoc (The Envoys of Chaos #0.5)

No Mercy, No Questions Asked.

Cork has quickly made a name for himself among the Kosellan mercenaries, but now his boss has come to him with an unusual job. Cork’s erstwhile countrymen, the Winn, have hired him to travel into the barren Frozen Lands and destroy a convoy, leaving only one survivor.
Cork isn’t sure he can trust the Winn. He feels like a pawn in their political game. However, his mother is sick and the Winn have promised to heal her if Cork does the job. And killing is what Cork does best.
To make matters worse. Cork’s crew has been decided for him: Arabella, an inexperienced and infuriating archer, and Nessa, a gloomy criminal with murder on her mind.
Cork will have to figure out how to complete the job, avoid Winn treachery, and manage conflicts with Arabella and Nessa along the way.

It's going to be chaos.