"What is the hardest case to solve?"
In present-day Salem, a serial killer known as the Bell Killer begins murdering seemingly unconnected victims. Police Detective Ronan O'Connor is able to track down the Bell Killer, but is thrown out of a window and shot to death during a fight. He returns in the form of a ghost, and learns that in order to reach the afterlife and meet his wife Julia, he must first discover the identity of his killer. With the help of Abigail, the ghost of a Puritan child, Ronan is able to use his ghostly abilities to return to the fight scene, and discovers that a medium named Joy witnessed the fight, and is now hiding in a church.
Played in a third-person view, the player navigates the protagonist, Ronan, around town. There are multiple areas in Salem to explore, such as a church, an apartment building, and a graveyard. The player completes levels in order to progress further into the game. There are hundreds of collectibles in the game, including 'Ghost Girl Messages' and various different types of scraps of paper which contain information about Ronan's life. Since the character is a ghost, he has a number of ghostly abilities such as teleportation and possession. Each area has clues to collect to progress through the level and the story; the clues are found in a way similar to L.A. Noire's investigation sequences.
Source: Wikipedia, "Murdered: Soul Suspect", available under the CC-BY-SA License.