So I look on the Ship List for 1894 and there's the HMS Immortalité at the bottom without a fleet assignment, which usually means it's laid up or being used for training but hey could be in the Black Sea, right? Plus, it's named "Immortality" which is of course great for Secret Vampire Monitoring Ship names.
So just yesterday I'm writing the annotation for that ship and I decide to look into the captain, to see what I can find. Its captain -- until his sudden and mysterious death in 1893 at the ripe old age of 47 -- was Sir William Wiseman, 9th Bart.
In 1894, HMS Immortalité is thus without an official captain, hence its Reserve status.*
But back to the mysteriously stricken 9th Baronet Wiseman. His son, Sir William Wiseman, 10th Bart., joined MI6 and headed the SIS station in New York during WWI, a little station called ... (wait for it) ... Section V.
ARE YOU KIDDING ME WITH THIS SYNCHRONICITY CRAP ALL I WANTED WAS A SHIP WITH NOTHING GOING ON IN 1894 AND IDEALLY A VAMPIRE-Y NAME AND YOU DUMP THIS IN MY LAP WAY TOO LATE FOR IT TO SHOW UP IN THE BOOK EXCEPT FOR ONE LITTLE BEENSY FOOTNOTE WHAT THE ACTUAL HELL
* Okay, technically Wiseman relinquishes command in Aug 1892 to Alexander McKechnie, who commands HMS Immortalité until May 1894. But during the relevant period in the unredacted novel, it is well and truly not officially captained.