Thoughts on the new Sophie Hannah

It fascinates me when a book starts out as one idea and transitions to something you didn't know was coming and does it seamlessly.  That's the experience I just had with The Cradle In The Grave.  Without giving it away a medical issue comes up that is current and needs a lot more investigation and that despite numerous studies to the contrary I still wouldn't put a member of my family through.  There is also that number puzzle I mentioned in the last post which I'm ashamed I couldn't work out.