A bitter separation, a custody dispute and growing concerns about the welfare of three children formed the backdrop to a devastating series of events in Edinburgh. As investigators pieced together what had happened, disturbing questions began to emerge…

In 1929, Kate Jackson was found critically injured outside her bungalow in Mumbles. As police began investigating the mysterious attack, they discovered that the woman known at one point as Madame X had spent much of her life in a tangled web of aliases, secret relationships, unexplained wealth and conflicting accounts of her past…