Jason Actually it is a different series from Devotion of Suspect X and Salvation of a Saint. While the latter have Professor Galileo, this is about detective Kaga. And as far as I know this is the only one translated from this series
Lei This is the No.4 book of Kaga's series, but all the books from this series can be read alone. If you read previous, you could know the history and the character of the main character, detective Kaga. But as I know, none of other books from this series are translated into English. If you could read other language, you could read them first, but yes, all the stories are standalone.
Nimish Sawant It can be read as a stand alone novel. It has no connection with either Devotion of Suspect X or Salvation of a Saint.