Second book in the Saburo Sugimura series, this novel is quite slow and felt very long. I liked it overall, and I want to continue the series, but it is not my favourite detective novel.

First novel in the Saburo Sugimura series,『誰か』is a slow-paced investigation that introduces the reader to the protagonist Saburo Sugimura as he still works as a salary man and has nothing to do with crime and investigation.