Inbetweeners by Barbara Elsborg

An angel and a demon walk into a bar… It should be the start of a joke except Emmett and Phoenix loathe each other the moment they meet. Reluctant and mismatched partners they may be, but they’ve been given a job to do on Earth: persuade the newly dead to move on to the next world.

A friendly word here, a nudge there, all the dead should need is a push in the right direction—but unknown dark forces are working against the pair, and the mission takes a dangerous turn.

From hate at first sight, to toleration, to something more… The clock is ticking. Time is running out and soon Emmett and Phoenix will be torn apart and returned to the worlds they came from. Though neither is willing to go back without a fight…

…. Because being dead has never felt more alive.