The Dying Hours

The Dying Hours is a 2013 book by British author, Mark Billingham. It is one of a series featuring his signature character, Tom Thorne.
Synopsis.
Tom Thorne has returned to uniform duties, having been removed from the Murder Squad. Thorne is suspicious of a spate of deaths of elderly people that are officially ruled suicides, and begins investigating alone. Soon, he finds himself on the trail of a serial killer who preys on the elderly.
Reception.
In the "Tampa Bay Times", the author was described as 'fiendishly clever about subverting our expectations' with the 'breathtaking and surprising climax'.
A lengthy feature was published in "The Independent" while Billingham was also interviewed by "The Daily Telegraph" and BBC Radio 4.