Part 1 - Join the teenage Holmes and his friends in a desperate race to unravel the mystery of the London Vampire before more blood is spilt on the dark, dingy and dangerous streets of Victorian London. Murder, mystery and menace follow hot on the heels of the boy who is destined to become the world's most astonishing detective. Who is the masked figure that stalks the streets in search of blood? What secret does he hold that will forever change the life of Holmes and his closest friend? Why does "the Agency" want Holmes to join them?