Joining forces with the devil? It's more likely than you think

It's been six years since the Apocalypse failed to happen and Aziraphale and Crowley are enjoying a happy life together in Soho. But then Crowley suddenly disappears, leaving a very worried angel behind.
Meanwhile Lucifer's working on a new case and is very determined to solve it. The last thing he expected was to run into the two infamous traitors while he did so.