A new case draws Detective Decker and Lucifer far out of Los Angeles and to the small town of Sunnydale, where not all is as it seems, and the supernatural abounds. After a run in with Buffy Summers, the two learn about the scope of the murder they are investigating, and are determined to do something about it. Meanwhile, Buffy's just hoping the Devil doesn't destroy a good friend.

Set in an AU future where Buffy and Spike are back together and living in the UK.( Home is Where They Have to Let You In, Old Friends, Everytime You Say Goodbye, or any of the short reunion fics, etc.) but are visiting in Los Angeles for some reason.One evening they encounter Detective Decker and her unusual partner in crime solving. Crossover with Lucifer.