The Bedlam Detective, by Stephen Gallagher
Seems I'm all about the character development and Becker is one helluva a character. With his own house full of demons to contend (with including being ousted from a seemingly stellar career as a Pinkerton agent in America and a brilliant but vastly troubled son) Becker's sorrow and yet unwilling obsession with discovering origin of the "monsters" that have plagued the town of Arnmouth as well as Sir Owain himself is riveting. Ultimately, while this books is a stunning page-turner of a mystery, its real power is in its depiction of what grief and guilt can do to the mind and heart. Again, I'll be in line for the next book in the series.
Barnes & Noble