Being John Barrowman Rehearsed Reading

Being John Barrowman by Tessa Hart.
A Rehearsed Reading.

Christmas Eve.
On top of a skyscraper.
Sky is right at the edge.

Sky is also convinced of actually being John Barrowman.

Can Sky's oldest friend Alex, together with an overeager police officer, a shopping centre Santa Claus, a depressed workplace counsellor and a window cleaner who really just wants to go home, stop Sky from jumping?