A typical afternoon in the park turns into a nightmare for single mom Karla Dyson when her son suddenly disappears. Without a cell phone and knowing she has no time to wait for police help, Karla jumps in her own car and sets off in pursuit of the kidnappers. Karla will stop at nothing to recover her kidnapped son.

Five-year-old Saroo gets lost on a train which takes him thousands of kilometers across India, away from home and family. Saroo must learn to survive alone in Kolkata, before ultimately being adopted by an Australian couple. Twenty-five years later, armed with only a handful of memories, his unwavering determination, and a revolutionary technology known as Google Earth, he sets out to find his lost family and finally return to his first home.