To me the scenario isn't too far fetched. They did have a habit of leaving very young children alone. They are both doctors. It isn't too much of a leap to think they would use some sort of drug to get them to sleep and keep them that way while they go out without them. It's the 25 days later thing that is the problem to me. Not meaning to be crass or gross here, but wouldn't a dead body start to stink by that time?