The Reapers Trilogy [Davis]

Phoenix, Singapore, and Shanghai are Reapers who collect the souls of the dying or already dead and transport them to the Gateway, where they will travel to their final destination...or so they are told.  

Beyond the Gateway is book number two in The Reapers Trilogy. Reapers collect the souls of the dead, including wayward ghosts who wander the city streets, and transport them to the eternal Gateway, believing they are going to a better place. But are they? Phoenix and Shanghai find a holographic recording left behind by a fellow Reaper who was recently executed. The message leads them on a journey to learn the answer to a crucial question: Does the Gatekeeper, the tyrannical ruler of the world, consume energy from souls in order to maintain power and live for centuries?

The world is in chaos. Alex is sending powerful killing machines into Chicago to enforce her will, Reapers are being rounded up and executed, ghosts are everywhere with no one to collect them, and a cruel terrorist is strapping firebombs to children. Reapers Phoenix and Shanghai come into possession of a mirror that once teleported its bearers wherever they needed to go. Alex is obsessed with stealing it, but so far no one, not even a heavenly Sancta who joins the Reapers, knows how to get it to work.