Review: York Mediale, Baba Yaga, Common Ground Theatre and Hannah Bruce and Co, Piccadilly Car Park, until Saturday, 7pm. Box office: cgtheatre.co.uk

NORMALLY Piccadilly Car Park, that monument to gaudy Eighties design, red railings and all, shuts down at 6pm, leaving the pigeons to roost.

All this week, however, people with headsets and mobile phones are to be spotted hanging around the exits at 7pm, waiting instruction to enter.

Already they will have loaded up an app that will facilitate their participation in one of York Mediale's home-grown digital pieces – an immersive, site-specific audio experience – courtesy of Common Ground Theatre writer, actor and director Hannah Davies and Hannah Bruce and Co's sound and design duo, Hannah Bruce and Jonathan Eato.

The two Hannahs have re-imagined an ancient Slovakian folk tale as a modern-day urban drama, swapping a deep, dark forest for a deep, after-dark multi-storey car park. Everything goes on within your headset, fed narration (the ever poetic Davies), dialogue (Dave Jarman and Audrie Woodhouse), imagery and echoey concrete sounds that play on your imagination, your fears.

For this is the disturbing tale of troubled, lost soul Lisa, her rigid, controlling boyfriend and Baba Yaga, the old hag who leaps through Lisa's dreams and may or may not help her (or devour her instead).

The car park, its stairwells, tiles, empty floors and compact curves to the exit, take on a claustrophobic character as Davies's hushed voice leads you around the next corner, drawing you further into Baba Yaga's lair.

At this stage, Davies's sound installation is an experimental 30-minute work in progress, but be sure it will progress further and hopefully return to Piccadilly in fuller form. Already it's all in your head, and every witch way you turn, Baba Yaga will be there, pounding at your chest, your head set.

Charles Hutchinson