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I have bequeathed both my eyeballs to a redhead named Tabitha. Don’t blame me: it’s the fault of The Swell Mob, ninety minutes of supernatural skullduggery above and below ground in the COLAB factory, Borough. Such is the pull of this immersive piece, set in an 1840s hellmouth with an aesthetic resting heavily on bowler hats, moustachios, and dead girls with terrible backstories that there now exists a document entitling Tabby Skinner (taxidermist; bookmaker; menacing pair of scissors) to both my eyeballs in the event of my death. This was in exchange for a fairly savage tarot reading. 

If you like your fun frenetic, frightening, and with a strong flavour of Undead Bill Sykes, this is the show for you. You start off in a pub on surface-level, peopled by welcoming/vicious patrons and madmen, all eager to prise from you the five pound coins with which you’re issued on arrival. Whether you choose cards, bareknuckle boxing (observation only), or weaving into dark corners to open drawers and examine mirrors, what follows unites and divides the audience as you try to solve the mystery of the Swell Mob and their dastardly (and diminutive) Master. The pub setting initially feels quite Punchdrunk, reminiscent of the Manderley Bar in Sleep No More – however, your ticket includes two free drinks, making this the polar if not the global opposite of Punchdrunk and all their works. I advise you to get on with drinking those quite quickly, in order to disinhibit you during what follows. 

There are different types of immersive theatregoer. I’m an explorer – I want the weird dark corners, secret passages and demonic contracts to be found inside The Swell Mob’s unlocked drawers, subterranean caves, and behind-the-bar lairs. Give me your bones, your suspended doll-limbs, and let me get my grubby hands on them. The Swell Mob does not disappoint. Despite the relatively small space, there’s ample opportunity to wander, and superb details that’ll leave you longing to return. The trip down to the cellar passes the building’s pigeonholes with plastic-wrapped post visible in the slots. Audience noises from COLAB’s other shows are intermittently audible. Unexpectedly, this really works – the fact that these underworld darklings unconcernedly pass circuitry and plumbing almost two centuries their juniors only reinforces the idea that the bloodshot, sweaty Swell Mob are the supernatural cellarage of redeveloped Bermondsey. Without giving too much away, the plot progresses quickly. On press night, the audience warmed up hugely in the last 30 minutes, as gin entered bloodstream and little teams of explorers tried to solve the mystery of the Master. Occasionally, you feel the pressure of time: I worry I derailed matters by being distracted by Tabitha and tarot moments after I was told to hand an important plot-point to the woman with white feather in her hair. Mid-way through the one-card character assassination, I looked up to find the woman with white feather standing beside me: had the poor girl been forced to seek me out, and was she now not waving so much as drowning? 

Probably not. The cast are made of sterner stuff. It’s not clear how deep the specific 1840s connection runs (I withheld comments about Jane Eyre and the possibility of European revolution), but the cast’s commitment is total. There are some electrifying performances; online details of the casting are deliberately sketchy, to preclude spoilers, but Louisa (Jordan Cooper), Elizabeth (Jordan Chandler) and Tabitha (Rosy Pendlebury) are outstanding. This is a vital show that proves that stories can be immersive and compelling without a vast budget. There are moments when you start to think and feel like a character in the story, genuinely scared and exhilarated. I’ll be returning on my own time and dime, and there’s no greater tribute. Whatever your inhibitions or misgivings – and this is not a show for the passive observer – The Swell Mob’s spell lingers. Returning to the surface, the streets outside seemed colder as I made my way to Borough Tube. Visible from the station is the spire of St George the Martyr: the church against which the Marshalsea prison once stood, where Dickens’s father was imprisoned, along with all the other victims and villains of the real Victorian era. When the church crypt became too crowded, the Victorians extracted nearly 1500 crumbling coffins and sent them off to Brookwood Cemetery, created by the London Necropolis Company to house the overcrowded, graveyard-bursting dead. Against that backdrop, The Swell Mob’s story seems only too plausible – and the London evening stayed just that little bit murkier.

THE SWELL MOB, Flabbergast Theatre, *****, COLAB Factory, London. 4 May–25 August, Thursday–Sunday, tickets £26. Book online or via 0333 666 33 66 (+£1.75 booking fee).