A guy is in a car crash and the results is a split. Not a split personalty but a split reality, at least from his perspective. In one reality his son survived and in the other his wife survived. Unexplained slight changes exist in each reality. He uses these slight changes to solve crimes in both worlds.
One problem is that if this was a split in reality at the point of the accident then why so many differences in both realities. Does one person living and not dying really change the world that much?
The show is well acted but future episodes suggest a more conspiracy type show. Hopefully it is not a dream, purgatory, or coma.