When cities remember, their secrets refuse to stay buried. In Greybridge, the past is never silent. It whispers through cracked walls, hums in forgotten tunnels, and waits for someone brave enough to listen. Sixteen-year-old Mara Ilie has always heard echoes—memories trapped in stone, fragments of voices imprinted on walls, the lingering fear of those who came before. For years she has hidden this gift, dismissing it as imagination. But when teenagers begin to vanish without explanation, the echoes grow louder, pulling her toward the city's darkest foundations. With her best friend Luca at her side and Eli—a boy whose loyalty is divided between truth and family—Mara descends into Greybridge's abandoned tunnels. There, beneath the streets, they uncover remnants of a secret experiment designed to weaponize memory itself. Polaroids of missing teens, rusted equipment, chambers that once held children as "listeners"—the evidence is undeniable. And the city will do anything to keep it hidden. As fear spreads, Mara realizes that the echoes are not only fragments of the past. Some are warnings of what's still to come. To survive, she must decide who to trust, face the lies buried in her own family, and find the courage to speak a truth powerful enough to shatter silence. Echoes Beneath the Streets is a gripping young adult thriller where mystery, supernatural suspense, and the strength of friendship collide. Perfect for fans of Stranger Things , City of Ghosts , and The Darkest Minds , this novel invites readers into a world where every wall remembers—and some secrets are louder than screams. Because silence doesn't keep you safe. It only hides the truth.