Law & Order: UK S05E02 - Safe

When two year old Ryan Stark goes missing from a high street merry-go-round, his distraught mother reports him kidnapped and a massive police hunt is launched to find the missing toddler. In spite of public appeals and additional police manpower, the search throws up more questions than answers. The legal case uncovers a history of dealings with the social services before Ryan went missing, something which raises the possibility that his mother isn't being entirely truthful.