The play begins with a father, Salter, and his son Bernard (B2) discussing the fact that the son has found out that he has been cloned.
The first clone then finds out the original is still alive. Bernard (B1) meets with Bernard (B2) and murders him, and then proceeds to commit suicide. Salter then meets with Michael Black, another clone. Michael Black lives a very normal life, has a wife and three children, and is happy. Salter ends up miserable and seemingly alone even though he knows that there are 19 more clones.