On 18 March 2008 a two-year-old boy was beaten to death in a Texan border town. His aunt, Mayra Rosales, was the only one with him at the time and was charged with his murder. But was this really possible? Mayra weighed nearly 500 kg, was bed-ridden and totally immobile. So why was she confessing to a heinous crime she seemingly could not have committed? This incredible film follows the many twists and turns in the case with intimate interviews with Mayra, her family, and the investigators, lawyers and doctors involved.