Us dark few (Los Oscuros, 1)

Khalani Kanes has never set foot on the surface. Humans have lived underground for centuries, and she has never left the city of Apollo. Her greatest desire is to visit Genesis, that idyllic place where humanity lives bathed in sunlight. But when she is sentenced to life imprisonment for a crime she didn't commit, her few remaining hopes are shattered. Every second in Braderhelm Prison is a fight for survival. She thought the violent inmates would be the biggest threat, but when she encounters Takeshi Steele, the captain in charge of her section, she realizes how wrong she was. As cold as he is ruthless, Steele will break Khalani before allowing her to escape to the surface, something no prisoner has ever managed. Traps and secrets await her in the shadows of the prison. To survive, Khalani will be forced to fight the criminals and reveal the truth behind her imprisonment. Otherwise, the prison may become her tomb.