Not having read the 'Stolen in the Night: A Novel', we can only speculate about the main characters. It's possible that there is a protagonist who is on a quest to find out what was stolen during the night. This person could be a journalist looking for a big story, or a regular person with a strong sense of justice. Then there might be an antagonist, the one who stole the item or the person behind the theft. And there could be supporting characters, such as witnesses, other people in the community where the theft took place, or even the police officers who are involved in the case in some way.
I don't know who the main characters are in this novel as I haven't read it. But they could be people like a detective, the thief, or the victim of the theft.
Since I'm not acquainted with 'Stolen in the Night: A Novel', it's hard to say exactly who the main characters are. However, based on the title, it might include a character who has something stolen from them. There could also be a character who is involved in the stealing, either directly or indirectly. And perhaps there is a third character, like a friend or a family member of the victim, who helps in trying to get back what was stolen.