[coldtea]

>What's that thing called when a kidnapping victim falls in love with their captor?

It's called pseudoscience:

Namnyak et al. (2008) A research group led by Namnyak has found that although there is a lot of media coverage of Stockholm syndrome, there has not been a lot of research into the phenomenon. What little research has been done is often contradictory and does not always agree on what Stockholm syndrome is. The term has grown beyond kidnappings to all definitions of abuse. There is no clear definition of symptoms to diagnose the syndrome.[35]

FBI law enforcement bulletin (1999) A 1998 report by the FBI containing over 1,200 hostage incidents found that only 8% of kidnapping victims showed signs of Stockholm syndrome. When victims who showed negative and positive feelings toward the law enforcement personnel are excluded, the percentage decreases to 5%. A survey of 600 police agencies in 1989, performed by the FBI and the University of Vermont, found not a single case when emotional involvement between the victim and the kidnapper interfered with or jeopardized an assault. In short, this database provides empirical support that the Stockholm syndrome remains a rare occurrence. The sensational nature of dramatic cases causes the public to perceive this phenomenon as the rule rather than the exception. The bulletin concludes that, although depicted in fiction and film and often referred to by the news media, the phenomenon actually occurs rarely. Therefore, crisis negotiators should place the Stockholm syndrome in proper perspective.[7]