'Night Soldiers' by Allan Furst. In 1934, a teenage Bulgarian fisherman is killed by a Fascist mob. His older brother is recruited to join the Soviet KGB. Trained as a spy and assassin, he is sent to Spain to fight in the Civil War.

For fantasy, try anything by Tanith Lee. 'Night's Master' is set back when the Earth was still flat, and demon lords rode up from the Underworld to seduce and/or terrorize the humans.

Hi there. Per rule 3.3, please post book recommendation requests in /r/SuggestMeABook or in our Weekly Recommendation Thread. Thank you!

Battle Royale by Takami Koushun. Most of the characters are high schoolers, but they have to kill each other. Also, I don't think the target audience was for teens back when it was published. I believe this was the book that inspired Squid- and Hunger Games.

I haven’t read many of these books or authors but I have heard amazing things about these. Books by Colleen Hoover( not my thing but well liked) Emily Henry, Taylor Jenkins Reid ( four of the books are connected) Brandon sanderson, Penelope Douglas, Christina Lauren, Fredrick Balkman, Sally Rooney And talia hibbert. Crazy rich Asians, the night circus, project Hail Mary, Eleanor opliphant is completely fine, The kiss quotient, and the love hypothesis. This is all I could think of at the moment. I hope one of these recommendations are something you’d enjoy