Do you have a twin? Presumably not. Imagine you cross your twin in the street, not someone who looks like you, but your clone. For it is indeed this: a student discovers a twin, dangerous criminal, who is confused. Imagine his surprise and joy! Meanwhile, a biologist, confronted with this improbability, will investigate and develop the academic world in all its forms. For it is well out of twin somewhere! Born of another mother, at a different time: this is curious. Even more curious: a third sister made about him ... With this scientific-detective novel, Follett leaves his favorite genre is espionage. It contains the qualities of the author: realism, love, suspense.