Eloise (Thomasin McKenzie) has been brought up in rural isolation by grandmother after suicide of her mother and disappearance of father. She has developed an unhealthy obsession with the swingin'sixties (granny's influence) and sees he mother in the mirror. Gets entrance to London College of Fashion.

Arriving as a naif in London today she opts out of the student flat she has been assigned and rents a bedsit from an elderly lady.

In her new room she finds herslef travelling to sixties London and observing the progress of Sandy, a new girl in London then wanting to be the next Cilla Black. Initially all is fine, but gradually things turn darker for Sandy and terrorizes Eloise who finds herself powerless to intervene.

Gradually the demons from the past start to manifest in her present reality as she appears to be tipping over into madness.

It turns out all is not as it seems and

[spolier alert]

Sandy has not been murdered but the landlady did have some skeletons (almost literally) in her closet.