Also, may I point out that the WIFE was in NO WAY involved in that couple "driving themselves off the map" as you so sweetly put it.Excellent point, Katy. The same dynamic was at work in "Crouch End," at the other end of the series: The wife spoke good sense from the beginning, but the husband refused to listen and dragged them both into disaster.
Come to think of it, that's pretty much the plot of The Shining, isn't it? Have we spotted a motif? (In Stephen King's fiction, I mean. That this is a motif of real life is undebatable.)