
Ok, so this is technically the second in the series, serving as the sequel to Post Mortem, which released in 2003. The third game, Still Life 2, released in 2009 Here's the plot:
"Two separate murder cases, in two separate lifetimes -- so alike .. so similar in the smallest of details that one could believe they were performed by the same person. Impossible! One of the crimes took place 75 years ago, while the other just happened! Is someone copying an old serial killer .. or is it remotely possible that the same murderer is still alive and committing more crimes?
Victoria McPherson is an FBI agent investigator based in Chicago. While visiting her father and talking about their family, they discuss her grandfather, former P.I. Gustav McPherson (from Post Mortem). Finding Gus' diary in an old attic trunk, she picks it up and begins to read ..."

Still Life is a point-and-click adventure, where you play two characters in different time periods investigating similar murders. Gameplay is done in the third person(as opposed to Post Mortem, which was done in first person). If you haven't guessed yet, art does play an important role in the game, though you'll have to play it to find out how much of an influence it is.
The game's also got a reputation because of its ending, or lack thereof. While it does come to a climax, new information is presented at the end for Agent McPherson to investigate, so the game feels unfinished(this was due to massive budget cuts at Microids, the game's developer, while working on this project). Thankfully a third game was finally produced, which closes the story.

If you enjoy more adult-oriented adventure titles(and have a thing for Jack the Ripper-esque villains), you'll probably enjoy Still Life. You also don't have to play Post Mortem beforehand, though it will certainly help set up certain characters.
Here's the game intro:
http://www.youtube.com/watch?v=7yJuOYBffGY












