This book is said to be a thriller, but it isn't. Instead, what could have been an intelligent historical novel was spoiled by supernatural silliness.

Lydia was ghostwriting the last couple of chapters of a scholarly work on Newton and alchemy that was being written by Elizabeth until her death. Cameron, Elizabeth's son, asked Lydia to do this. Cameron and Lydia are former lovers, and Lydia narrates this story as a letter to Cameron.

But the author lost me when she went supernatural, when Lydia visited a psychic and when she began to notice too many coincidences. It is too easy for a writer of fiction to explain mysteries with ghosts.