SHORTLISTED FOR THE DONALD MEEK AWARD It's the kind of story no journalist can ignore, and Roddy Maclean is intrigued by Mairi NicEachairne's claim that she knew Lee Harvey Oswald and had to flee the States and change her identity to escape JFK's enemies. But does Mairi's account stand up, and why has she waited so long to prove Oswald's innocence?