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.

Passage: After struggling with infertility, Anne finally succeeds in getting pregnant through invitro fertilization with her husband Jack. However, one night, Anne awakens to discover a masked intruder in her room. Terrified, Anne tries to escape, but the intruder chloroforms her into unconsciousness, rendering her helpless as he kidnaps her and takes her to an isolated house.
In the morning, Anne finds herself held captive by a couple named Frank and Helen. Helen has gone mad after her baby was aborted by Frank upon learning that it would have been born deformed. The procedure left her sterile, and he is now attempting to make it up to her by giving her Anne's baby. Anne recognizes Frank as a technician at her fertility clinic, and Helen later tells her that he secretly replaced her fertilized egg with one of Helen's instead. Frank stages a car accident with a horribly burned body to make everyone believe Anne is dead; Jack refuses to accept it and pressures the police to continue investigating, but after several months they dismiss his ideas.
What is the name of the character who is kidnapped and taken to an isolated house?