In case you’re interested in Brazilian classical literature, I recommend ‘A moreninha’ de Machado de Assis

La sombra del viento by Zafon (I think it's a good way to improve Spanish because it's not basic Spanish but at the same time easy. A true page-turner

Hello! I see on your profile that you have an advanced level of Spanish so I would recommend a novel called "La casa de los espíritus" by Isabel Allende. It's a classic of magic realism that tells the story of a family and it's very entertaining.

Oi, Jessica. "Quarto de despejo" de Carolina Maria de Jesus. Ele conta a rotina de uma mulher pobre que vive em uma favela no Brasil. A linguagem é simples e a história é emocionante.