Shadow's Edge by Brent Weeks (Book 2 of the Night Angel Trilogy)

A modern classic of epic fantasy, Shadow's Edge is the second volume in the multi-million copy selling and New York Times bestselling Night Angel Trilogy where Kylar Stern has given up the way of shadows for a life of peace, but when an old ally returns, Kylar must make a deadly choice.

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?