Catch a Killer brings a lot of firsts to Facebook. It's one of the first major social games from MMORPG developer Sony Online Entertainment and one of the first social games to be heavily promoted based on the involvement of a celebrity author. Casual games are frequently based on popular novels and writers, though, and in many respects Catch a Killer feels like a casual game that's been taken online. While it has avatars, items, and energy-based tasks to complete, it's also heavy on mini-games and searches for hidden objects.