Well, Susan has a theory.
I'm pretty sure Sherlock Holmes wouldn't stick his nose right in someone's neck. He'd smell them from across the room.
I would say more like Professor James Moriarty...
Both Holmes And Moriarty would already know the answer
I mean, how many Linages are there, with telepathic sorta-fraternal sorta-twins
@BattleStarX: Well, the ORIGINAL Holmes probably wouldn't. Most modern interpretations of the character tend to to up the "eccentric jerk" aspect and lower the "heroic gentleman" aspect.
@Merrsharr: I'm not sure he noticed; that was quite in an aside moment between the two girls. It could be swept under the storytelling rug, and the two girls accompany each other under another relationship.
...Seems too obvious. Then again, if the rules of funny are still clinging to them, it would be appropriate. :,D
Like any good medical drama, the first diagnosis is always wrong. Who else is Holmes-like in their skills? Moriarity, of course, has been nominated(And is much more likely to try strangling Susan, isn't he?)
Also: Holmes eliminates the impossible, not the unlikely ("nobody has a Dam")
Spider motif, unpleasantly arrogant behavior, chessboard pattern on his tie, and skeletal Sire-shadow point to Moriarty. That's pretty obvious. I'm assuming Julian is the Moran-child, given the good Colonel was the only one that Moriarty communicated directly with.
EDIT: Oh, and he just sits in a cafe ordering others to do stuff for him. That's pretty Moriarty.
Hmm, I also feel that Holmes is too obvious, though Susan immediately jumps to "Holmes," so our fair authoress never meant to fool the audience if Holmes IS correct. Or maybe Susan's just a little off the mark: Auguste Dupin? I don't see Holmes, Moriarty, or Dupin having a "boss", though. Especially not a boss like what little we've seen of this one.
It's difficult with the way that lineage children do not have to completely follow their sires/dams (and, in fact, don't WANT to if the ending is bad for them--the whole "learn the lesson your sire/dam did not" thing.), so we can't necessarily judge by small details.
@ArrN: Chessboard pattern, or harlequin pattern (death connection, after all), or an indicator of a black-and-white philosophical outlook, or just a design that looked cool! It's going to be a long wait for Thursday...
@Nomen: A chessboard pattern points towards strategic thinking and a tendency to think a couple steps ahead of opponents. Both are necessary qualities for chess players and both are probably going to be possessed by Moriarty-children. It fits with the other clues, so I'm sticking to it.
Then again, there's one other Holmesian villain that could fit (Charles Augustus Milverton), but I'm sticking with Moriarty and keeping the Napoleon of blackmail in my back pocket so I can cry "I knew it!" if it's confirmed.
Then again (again), this guy may not be able to logic his way out of a wet paper bag, given he's taking more than one or two sentences to figure out the Sires of the two girls with diametrically opposed personalities. Or maybe he's just eliminating the broader suspects before providing a smoking gun to slam the point home. Maybe I'm wasting my time here and he actually is the Moriarty-child. Whatever.