This is good, although both I and my other half who read it before me both found the beginning poor. He didn't like the very quick time changes, but those soon settle down, and I thought the translation was a bit clunky, although flicking back now I can't find anything specific to quote! HOWEVER, that all disappears and this quickly settles down into a gripping, well paced, interesting book, with a scary story line and the odd unexpected lift of humour.
I liked our battered, stressed, damaged hero, loved his sidekick who started out as a bit of light entertainment, but acquired depth and character towards the end - and left unanswered questions, such as who was he, and how the heck did he get the job in the first place? The "heroine" is one tough cookie, and I read her chapters with as much interest and anticipation as I did the others - the author's trick of sliding her time line up to meet the book's present day created a gradual increase in tension that kept me seriously interested in what happened next.
So - I recommend this, I will be passing it onto other friends and family, and I'll keep an eye open for other work from this author.