The book is set in London, Norfolk and Hampshire and each setting is distinctively realised, as are both time frames. Descriptively, the book is strong in both time and place. I don't want to say too much about the plot for fear of giving it all away but I will say that the mystery draws in you in inexorably. I suppose, ultimately, it's about family history and how it feeds into the present, even if it's unknown, and about how much control we have over our own lives. Do past lives influence the lives we lead today? Do outside forces influence more than our own wishes and desires?
If you've read any of Bowden's other books, you'll recognise some of the characters. I haven't, but after thoroughly enjoying ''The Green Door'', I plan to rectify that soon. And I don't think you need to worry about missing anything: this novel reads perfectly well as a standalone. We also have a review of Bowden's [[The Amber Maze by Christopher Bowden|The Amber Maze]].
Another great story with an interesting psychic character is [[Maxwell's Mask by M J Trow]].