2/13Police investigate the murder of a reclusive millionaire at his home in west London.(R)
3/13A man dies in a house fire after being visited by a stranger. Can police find his killer?(R)
5/13When a child is murdered, a torn-up cheque gives police their moment of proof.(R)
6/13An organised crime gang is brought down by painstaking surveillance work.(R)
7/13A detective investigating arson clocks a problem with the CCTV, giving a moment of proof.(R)