Adult fiction Mystery - teen boy and girl kidnapped 2016

[Michelle]

I am looking for a book from 2016 about a girl and a boy who were kidnapped and left in a basement. They became involved. They eventually got out - can't remember how.

[Rainbowheart]

I assume you mean romantically involved.

How old were the boy and girl?

Is this book for teens or adults?

[Michelle]

They were high school age. They became involved once they were kidnapped. The book was definitely for adults.

[Lobstergirl, au gratin]

Please add genre and some more details to your topic header. For example, is this fiction or nonfiction?

[Kris]

Michelle, would you call this adult fiction: mystery, thriller, romantic suspense, etc.?

What are their jobs?

What's the location (country, region, well-known city, small town)?

[Michelle]

They do not have jobs - they are high schoolers. Might be set in a small town. Not a large city like Boston or Chicago. Adult fiction mystery.