'The voice on the other end of the phone was severe. 'It's your grandmother. She's been arrested.' ' Nick Robertson has become used to his grandmother Rosie's dotty behaviour. At 86, a widow now, she is determined that before life passes her by, she will live a little. Or, preferably, a lot. It wouldn't be so bad if Nick had nothing else to do, but with a job to find, two warring parents to cope with and a love life in terminal decline, he would prefer his grandmother to get on with things qu