After watching the latest episode, I'm convinced that Malcolm's son is the 'Master' Vampire...perhaps this is also why the bodyguard is involved?
We know from the flash backs that he had gone to Africa many times and he lost his son in Africa. The Egyptian symbols on the other vampire and the lore we hear from the interpreter earlier in the season highlight that the Egyptian lore is significant.
Also this would explain why Mina has not been turned and is being carried away by the Master vampire as we last see in the boat.
Oh, and our gunslinger Murikan Josh Hartnett is definitely a werewolf and the gruesome recurrence of Jack the Ripper in London.