Since detective Nick Lambert pushed his luck a little too far in the line of duty he has been moved to low-level assignments. But Nick has no idea that his first errand to check out an autistic girl who may be linked to a bizarre murder will pitch him into the most shocking and bewildering case of his career. Of any detective's career. At its core is a young woman who might just be the most important human being who ever lived – a woman who holds the key to shaping world events. Not just once, but over and over again. From the wastelands of 20th century Siberia to the dark ages of 12th century France, from present-day Los Angeles to a near future in which we see our worst fears realised.