There is a man centre stage reading the Guardian under a bright light. He scrunches up two pages and they become a kind of paper puppet which explores the table-top. The aptly named Improbable Theatre have demonstrated one of the techniques which they will use later to greater effect. And then: "Once upon a time . .. ", and there is a tale of a difficult birth and a baby resuscitated by the moon. Phelim McDermott interrupts the flow to warn the sole musician, Ben Park, that he has a squeaky stool and to be careful, and to introduce himself and his other two colleagues, Guy Dartnell and Steve Tiplady, and to let us know that his play is autobiographical and about some of the things that happened to him when he lived as a child in 70 Hill Lane in Manchester.

There was his granny who had a room in the attic, there was Dad who didn't communicate much and brought dolls back for Phelim's sister from abroad. There was his Mum, and his friend Carl and, central to the main narrative, there was Polty, the poltergeist who came to haunt the house for weekends. The play is about now (when he lives in Brixton) and then when he was a kid in the big old house in Hill Lane. The settings - the house, its individual rooms and his apartment in Brixton - are drawn quickly and deconstructed as swiftly in heavy-duty Sellotape by the three performers. The atmosphere is created by Colin Grenfell's good lighting and Ben Park's happy or soulful or threatening music.

The effect is to tell the story gently, without urgency and invoking always the imagination of the audience to fill in the detail. It is excellent and inventive theatre, unobtrusively and effectively directed by Lee Simpson and Julian Crouch.

Runs until Saturday, nightly at eight. Booking at (01) 874 8525.