After four-year-old Billy Sullivan goes missing from his father's garden an investigation is launched. CCTV footage shows the boy getting into a car with a false number plate. They soon discover that the false plates where sold to Peter Grigson. When the police catch up with Grigson, Billy is not with him. Grigson ends up admitting taking the boy but claims he called the police and said he dropped him off at a local market. (thetvdb.com)