Since we don't have much information about the 'captured caroline' story, it's hard to say exactly who Caroline is. She could be the protagonist, a victim, or a key figure in some sort of adventure or mystery.
Without more information, it's hard to say who Caroline and Nicolas are exactly. They could be ordinary people with an interesting story, or they could be characters in a fictional narrative.
The relationship between the mentor and the mentee might be based on real - life examples. Older, more experienced writers often take younger ones under their wing.