David returns home after a jog and discovers a brand new shoe outside his home. His wife, Louise is getting ready for work and she tells him things that need to be done for their daughter. We gather that he is a stay at home husband.
What comes as a surprise is David's obsession with the shoe. He initially left it outside hoping it will be reclaimed by its owner, then he brings it home determined that this shoe need not be alone but together with the other one. Louise is concerned by his irrational behaviour especially as she sees a chance for him to return work as an employment opportunity arises.
Inside No 9 episodes tend to have a macabre twist, this was is tinged with melancholy as we learn about the sadness in David's life just as he seemed to have got himself together until he discovered some vital mis-information.