It is the year 2049, and humanity is on the brink of extinction. Tania Deeley is a rarity: a human child in a world where most children are sophisticated androids called teknoids manufactured by Oxted Corporation. Though she has always been aware of the existence of teknoids, it is not until her first day at high school that Tania realizes that her best friend, Sian, may be one. If Sian could be a teknoid, how many others in Tania's life are not real?