Sara Isabella Cruz has spent her whole life believing that girls like her — parentless, penniless, patched together by scholarship money and sheer force of will — are invisible to the kind of world Estefanía Reyes was born into. Estefe is everything Sara has only ever watched from a careful distance: an heiress, a rising fashion influencer, effortlessly loved by everyone she meets. When a dropped library card turns into an unlikely friendship, Sara is pulled into a glittering circle of wealth, ambition, and secrets she never saw coming — Estefe's magnetic, guarded best friend Nick, who decides within a week that Sara is a threat to be managed, and Mason, the devastatingly charming new arrival Sara can't help but notice, unaware he's about to become Estefe's boyfriend for reasons that have nothing to do with love at all. Because nothing in this story is what it looks like. Estefe was adopted at birth. Sara is the daughter Ava and George Reyes lost in a hospital mix-up seventeen years ago and have never stopped searching for. Mason's fake romance, engineered to destroy the Reyes family from the inside, becomes devastatingly, inconveniently real. And Nick — who has loved Estefe in silence since childhood — finds his heart rearranging itself, slowly and against his own will, around the one girl he swore he'd never look at twice. Across shattered friendships, a mother's unknowing cruelty, a father's quiet mercy, graduation, heartbreak that scatters four friends to four different cities, and a villain who has been circling all of them since before they ever met, Where We Belong follows two couples toward a love neither one believed they deserved — and two young women toward the sisterhood that was always, secretly, theirs. It is a story about the families we're born into, the families we choose, and the long, complicated road home to the people we belonged to all along.