The sun comes out on a Saturday afternoon in Manchester. Proud young mum Claire is watching her three-year-old son Sammy in the local playground. A little girl falls. Claire bends down to help. When she turns round Sammy is gone.As each day passes, the chances of finding Sammy alive get slimmer. DCI Janine Lewis understands his mum's agony - she has four kids of her own.Day nine. A little boy's body is found in a sewer. Wrapped in a sheet.But this...