Shadow's Edge: the Night Angel Trilogy, 2 1st edition

From New York Times Bestselling author Brent Weeks...

Kylar Stern has rejected the assassin's life. The Godking's successful coup has left Kylar's master, Durzo, and his best friend, Logan, dead. He is starting over: new city, new friends, and new profession.

But when he learns that Logan might actually be alive and in hiding, Kylar is faced with an agonizing choice: will he give up the way of shadows forever and live in peace with his new family, or will he risk everything by taking on the ultimate hit?