Three months ago, 14-year-old Tracy Meade went missing from her home in west London. Two weeks later her body was found in the Grand Union Canal. She had been murdered. Hours earlier she had been seen in Shepherd's Bush - police hope someone may have seen who she was with. There's also a report on a chase through London's Covent Garden, which led to the fatal stabbing of Detective Constable Jim Morrison last December, after he discovered a thief rifling through a woman's handbag.