In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Example input: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Example output: Who believes Fagin's gang make wallets and handkerchiefs?.
Example explanation: This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.
Q: Passage: Matthew Van Helsing, the alleged descendant of the famed 19th century Dutch physician Abraham Van Helsing, owns an antique shop built over the site of Carfax Abbey in London in 2000. One night, with Van Helsing upstairs, his secretary, Solina, allows a group of thieves, led by her boyfriend, Marcus, into the shop. The thieves infiltrate the shop's underground high-security vault and find a sealed silver coffin protected by a deadly defense system. Based on the level of security surrounding the coffin, Solina and Marcus decide that the coffin's contents must be valuable, so they escape with it and flee to New Orleans. When Van Helsing discovers that the coffin has been stolen, he boards a plane to America, telling his apprentice, Simon Sheppard, to remain in London. Simon does not follow these instructions and follows his mentor.
Aboard the plane, one of the thieves manages to open the coffin, revealing the dormant body of Count Dracula. Dracula awakens and attacks the thieves, causing the plane to crash in the Louisiana swamps. Dracula survives the crash and travels to New Orleans, where college students Mary Heller and Lucy Westerman are living. Mary is estranged from her family and has recently been plagued by nightmares of a strange, terrifying man.
A:
What is the full name of the person that has an underground high-security vault?