From audible.com:

From master storyteller and Hugo Award-winner John Scalzi comes this Audible Original novella, winner of the 2017 Audie Award for Best Original Work. Emmy-nominated actor Zachary Quinto—best known for his roles as the Nimoy-approved Spock in the Star Trek reboot and the menacing, power-stealing serial killer Sylar in Heroes—brings his well-earned sci-fi credentials and simmering intensity to this genre-bending thriller.

One day, not long from now, it becomes almost impossible to murder anyone—999 times out of a thousand, anyone who is intentionally killed comes back. How? We don't know. But it changes everything: war, crime, daily life.

Enter Tony Valdez, professional Dispatcher. True to their name, these licensed assassins are tasked with humanely disposing of people in death’s crosshairs to offer them a second chance at avoiding the reaper. When a friend and fellow Dispatcher goes missing, Valdez is plunged into a web of intrigue both professional and personal.

It's a race against time for Valdez to find his friend before it's too late... before not even a Dispatcher can save him.

From audible.com:

From Hugo and Audie Award-winning author John Scalzi comes an exciting sequel to The New York Times best-selling, number one Audible hit The Dispatcher, performed by the incomparable Zachary Quinto.

Welcome to the new world, in which murder is all but a thing of the past. Because when someone kills you, 999 times out of 1,000, you instantly come back to life. In this world, there are dispatchers—licensed killers who step in when you’re at risk of a natural or unintentional death. They kill you—so you can live.

Tony Valdez is used to working his job as a dispatcher within the rules of the law and the state. But times are tough, and more and more Tony finds himself riding the line between what’s legal and what will pay his bills. After one of these shady gigs and after being a witness to a crime gone horribly wrong, Tony discovers that people around him are dying, for reasons that make no sense...and which just may implicate him.

Tony is running out of time: to solve the mystery of these deaths, to keep others from dying, and to keep himself from being a victim of what looks like murder, by other means.