The Blackwell Deception focuses on Rosa and Joey again and takes place some time after the third game.

Rosa then proceeds to solve two more murder cases and finds out that Lisa had referred both to a man named Gavin.

Since Gavin fed on a large number of souls he tries to resurrect himself but Lisa's ghost distracts him.

After Lisa's departure Rosa, confused by her purpose, decides to track down the organization that was behind Gavin and found a full scale "Ghost Investigation" agency.

Notably, this version changed the character portraits from the original comic-style, to a more realistic style matching the other games in the series.