I have long thought that the Barbican Centre complex, with its corridors and walkways and dark spaces, might well play host to, if not quite the undead suggested by this piece, then certainly people who have been lost for a very long time.

It’s a venue crying out for nifty site-specific exploration, which makes this undertaking from the Slung Low performance collective a cause for celebration. Nonetheless, they leave any possible successors plentiful room for improvement.

The initial business is so promising. Taken off in groups of three, we are issued with glow sticks and head torches, and invited to watch an introductory video from City Night Tours.

On this, a perky young man called, yes, Jonathan Harker, tells us that Slung Low have gone AWOL, so the Barbican has entrusted our entertainment to them.

Then it’s to a minibus, gunshots, confusion and eventually us being turned loose in one of the Centre’s tenebrous underground car parks with only a set of headphones as a guide.

This is the point, where shadows loom and people brush past us unexplained, when a drama that made it clear exactly what was at stake would be able to create an almost heart-attack inducing level of fear.

It’s a thrilling prospect for brave audience members, but what we get instead is an increasingly hokey voiceover that talks portentously of visions and shadows and vampire hunters.

I had little clue as to what was going on, which increasingly negated all Slung Low’s meticulous planning of the practical side of this experience.

Even so, standing alone in a barely lit Car Park Three and being told to follow a trail of salt crystals is quite an event in itself.

I wanted to stay for longer and try to piece it all together, but the whole event lasts just 35 minutes, with only half of those underground.

Less flap and greater clarity would make this a truly visionary experience.

Until 15 November. Information: 0845 120 7550, www.barbican.org.uk