DS John Boulton and WDC Suzy Croft invetigate the sudden death of an apparently healthy middle-aged woman who lived alone, the F.M.E tells them that it looks like she suffocated in her sleep which he says is unual for someone her age not to wake themselves if they're having breathing difficulties going through her belongings Suzy finds a few things out of place in an otherwise spotlessly tidy flat as well as the fresh flowers Polly found in the rubbish bin outside that lead them to belive that someone else had been inside the flat recently. her boss tells John and Suzy that she was a quiet person and he doesn't know of anyone from work who'd been to her home. They find from entries in her diaries that lead them to an old friend of hers he tells them that they had met up again recently for the first time in almost thirty years and had been seeing each other for dinner once or twice a week and that he went arond to see her the day she died but there was already a man there he describes t (thetvdb.com)