Rogue Sign by Elin Wyn

Nothing about a charming, rich playboy like Kovor should interest a person like me.
I’ve spent my life in the shadows, in the darkest corners of the criminal underbelly of Mars.
I’m going to use those hard-won skills to track down whoever, whatever, is targeting me and my friends.
No alien playboy, with his laid-back ways and handsome smile, is going to get in my way, even if his touch weakens the walls I’ve built to protect myself.
But when my mission turns deadly, I’ll find out that Kovor is keeping secrets of his own.