My son got Murdered Soul Suspect really cheap, and has had a good time with it from what I've heard. I've watched the gameplay, there's almost no violence you partake in at ALL. You do disintegrate floating wraith things, but that's about the extent. There is however depictions of violence in cut scenes, and in the fact that your character is murdered at the start of the game, and you play the entire game as a ghost. Because the game takes place with you dead, you encounter a lot of creepy beings, ghosts, wraiths, and other things as well, but not nightmare material. If you kid can handle some spooky stuff, it should be totally fine.There is some mild drugs, such as cigars and alcohol, but nothing in depth. The swearing is fairly mild, it does reach extreme levels, but it's nothing that kids don't hear at school.
The main character is also a good role model, as he's working for justice to try to find and stop his, and many others, murderer, and have him brought to justice.