Hakushaku Cain Series, Necromancer Recommendations
The premise of these manga are actually different. While one is set in a fantasy world where necromancy is possible, the other is set during the Victorian era where a young noble boy solves unusual mysteries.
The one commonality among both manga is how the reader is led to believe one thing during the beginning of the chapter, only to realize how unique the characters' motivations are, which lead to quite a few fascinating/surprising endings. So if you enjoy episodic mystery/thriller stories, you're definitely gonna enjoy both the manga.