I don't think it is. Such stories often fall into the realm of fiction, where the plot and characters are made up to provide an engaging and thrilling narrative.
It depends. Sometimes stories like this have elements of truth mixed with imagination. Without more context, it's tough to determine if it's truly based on a real kidnapping.
There's the story of Jaycee Dugard. She was kidnapped in 1991 at the age of 11. Her kidnapper, Phillip Garrido, held her captive in his backyard for 18 years. During that time, Jaycee had two daughters by Garrido. She was finally discovered when Garrido visited a university campus with his 'family' and some odd behavior led to an investigation. Jaycee's story is a harrowing account of long - term captivity and abuse.