Mr Chartwell by Rebecca Hunt.
A story based on Winston Churchill's depression which he referred to as his 'Black Dog' and who takes on the form of a real live, talking dog.
A most unusual book, based on a premise that should make it unbelievable, but which works very well. At times very funny, but with an undercurrent of unease running throughout. I disliked 'Black Pat' intensely, I didn't find him the least bit charming as some suggest, but loved the other characters, they were remarkably well drawn.
A very good read.