Set against the backdrop of an anxious, upscale residential colony in Delhi-NCR, this gripping contemporary mystery thriller follows an amateur investigator named Keshav as he is approached by Alia, a desperate mother seeking help. Alia's young daughter, Siya, vanished without a trace from her secure home exactly nine months ago, and the official police investigation has hit an absolute dead end. Drawn in by the mother's profound, unyielding grief, Keshav commits to a grueling, independent search for the truth. Over the course of 400 high-pressure days, he navigates a deceptive maze of neighborhood secrets, digital footprints, and deep family cover-ups, racing against the clock to solve an apparently cold case.