Imaginary Girls, by Nova Ren SumaRead about another entry on the list.
Chloe has always lived in the shadow of her big sister, Ruby. Everyone—including Chloe—thinks Ruby is charismatic and magnetic. The sisters are inseparable until the night Chloe lets Ruby convince her to swim across the reservoir, over the flooded town of Olive. But Chloe makes a dark discovery in the water: the dead body of her classmate, London Hayes. Afterward, she’s sent away to recover, but can still feel the tug of Ruby calling her home. When she finally returns two years later, she has begun to wonder what kind of secrets Ruby might be keeping. The novel uses magical realism and the straight-up supernatural to talk about the complicated and endlessly complex bonds that keep sisters together.