Genetic engineering is in the news again. This follows the resignation of Andrew Sabisky as special advisor to Boris Johnson after a twitter storm about his comments on race and intelligence: basically, black people are less intelligent than whites. Nice guy. Another of his internet posting from 2014 suggested the government could “legally enforce universal uptake of long-term contraception at the onset of puberty” to help prevent a “permanent underclass”. At the same time, Johnson’s advisor Dominic Cummings is reported as saying that the NHS should help fund genetic selectivity. It’s the return of eugenics into mainstream discourse—the desire to tamper with genes in order to cleanse society. In this context, a revival of Caryl Churchill’s 2002 play, A Number, feels particularly resonant.

The story is a family drama. With Churchill’s typical intelligence, it explores the situation that develops after Salter, a father who is now in his sixties, meets three of his sons (two of them being clones of the original). At first, he is visited by the troubled thirtysomething Bernard, and it is deliberately unclear which of the sons the young man actually is. Then it quickly emerges that although Slater wanted a clone of his original son, who he put into care at the age of four after failing as parent, the doctors have actually cloned a much larger number—about 20—and that these individuals are alive with no knowledge of their biological parentage. The tensions rise as the first Bernard, angry at his treatment as a child, expresses his feelings to Salter in no uncertain terms. Then things get even more explosive when the two Bernards meet.

Salter failed as a parent the first time around because he was a widower and because of some unspecified substance abuse. But while it might seem reasonable that a father would want to replicate a lost child, to make up for the deficiencies of his first attempt at parenting, the vision of the play is more nightmarish. With beautiful economy, Churchill destabilizes her own story, by shifting perspectives: at first this is a narrative about a young man who struggles with the fact that he is not the original he, then it is a narrative about a young man who struggles with the fact that there is another, younger man, who is genetically identical to him. Finally, it is about the anguish of a father who regrets his inability to be a good-enough parent.

At the end of this brief drama, which lasts barely one hour, Salter is visited by Michael, a clone who has no resentment and no interest in his genetic past. He works as a maths teacher and is married with three kids. His happiness and simplicity contrasts strongly with the confused feelings of the two Bernards, and now it is Salter who struggles to understand how this “son” could be so different from his clones. He asks him to tell him something special, something unique, about himself, but Michael cannot say anything that is out of the ordinary, or even not universal. With this gesture, Churchill turns the focus onto the audience: how does Salter’s question apply to us? What, in our genes or in our upbringing, makes us singular, individual, unique even?

The idea of clones, that there might be twins of ourselves living in society, people we could bump into, or spot in the distance, is disturbing to any idea of the uniqueness of our selfhood. It also reminds us of cultural myths about doppelgängers, doubles whose appearance foreshadows death. If Salter is the father of some 20 men, are they all the same? They might look very similar, but what are they like as people? How would it feel to meet several grown-up versions of your own son? The emotional core of the play is the promise of getting a second chance in life; and many of us might be tempted to have a second go at parenthood. Or, as kids, a second chance at playing the cards that nature has dealt us. But the subtle subtext of the story implies that duplication can have catastrophic effects on our subjectivity.

Polly Findlay’s production, like Lyndsey Turner’s current revival of Far Away at the Donmar Warehouse, is markedly more naturalistic than the original Royal Court staging. Gone are the abstract elements, just as the new Far Away is less a fairy tale than a real story. Both productions share the same designer, Lizzie Clachan, and she gives Salter’s home, where all the scenes are set, a mundane suburban normality that contrasts well with the moral enormity of the play’s implications. Each episode is seen from a different angle, mirroring the story’s revelations, and Findlay gets excellent performances from Roger Allam as Salter and Colin Morgan as his children.

Allam is bemused and bruised, moving around the set like a battered old buffer who feels guilty at his past failings and at first is evidently unable to grasp the magnitude and significance of a decision that he has made many decades ago. In his desire to start again as a father, he has begun a process he doesn’t entirely understand. He conveys a good sense of a man who is both evasive and likely to explode at any time. In his three incarnations of the same genes, Morgan—familiar from his starring role in the television series Merlin—demonstrates his versatility. At first he is a picture of bewildered hurt, then of confused fury, and finally of well-centered happiness. Yes, this character implies, it’s all about nurture rather than nature. If this intimate play feels a bit lost in the vast space of the Bridge, the performances are big enough to give it the required punch.

A Number is at the Bridge Theatre until March 14.

This post was written by the author in their personal capacity.The opinions expressed in this article are the author’s own and do not reflect the view of The Theatre Times, their staff or collaborators.