This series of stories introduces the young earl Cain C. Hargreaves, an eccentric loner millionaire who likes to solve mysteries and collect exotic poisons. This is the fourth volume(part 1) of the Cain Saga stories, which has 5 volumes and then continues in the Godchild manga series.
This is Kaori Yuki's longest story in the Saga yet, and it is the best so far. She has been lengthening the story length with each subsequent volume in this series and that has worked to her advantage, because these stories are definitely benefitting from the additional depth and attention she is giving to them. Characters feelings and motivations are coming more to the fore, and the mysteries are now beginning to feel like real mysteries to be solved, instead of just tasteful tidbits of a mysterious event served in bite-sized portions and resolved before they could ever evolve.
This is a two part volume, and introduces Gilbert, a friend from Cain's childhood who has gone insane, and we don't know why. It also continues following Dr. Jizabel Disraeli's disturbing stalking of Cain for his eyes. We also get a bit more backstory for Cain, and also more insight concerning Riff.
Each volume is getting better as I'm getting more into the storyline. I can't wait to pick up the next volume to finish the Cain Saga series, and then start diving into the Godchild series next.