Twin sisters born in Japan, separated at birth, grow up never knowing of each other. When one dies in a freak ski-lift accident in Europe 27 years later, the other sees her photo in the news, and it's like looking in a mirror. The surviving twin decides to investigate.

Meanwhile, the fiancé of the dead sister, a world-famous British journalist, falls into a deep depression. He decides to embark on a bizarre experiment, arranging for an AI-enabled fembot to be built-one that resembles his dead fiancé almost perfectly, right down to her skin, grown from DNA recovered from her human predecessor's engagement ring.

But while her looks and mannerisms are nearly identical to his dead fiancé, the fembot isn't human: she's a Chat-AI enabled robot with superhuman intelligence, physical capabilities and instant access to anything on the internet.

Then the living sister travels from Japan to London, hoping to track down the journalist and learn more about the sister she never knew. But when she comes to his door, it's not the journalist who opens it.

What happens next is... Jemini.

John Casti deftly explores the early stages of the most complex interaction in human history with this captivating, intriguing, very human story. Little wonder: Casti is renowned for non-fiction classics on complexity science, including Paradigms Lost, Complexification and others (as well as the Encyclopedia Britannica entry on the subject). Jemini: A New Kind of Love Story is his second work of fiction.