There is more intrigue at the National Portrait Gallery in London than 13-year-old Irish dancer Liffey Rivers could have ever imagined How will she tell the smug-looking security guard in the museum that she has discovered there is something WRONG with the Coronation Portrait of Queen Elizabeth I hanging in the Tudor Gallery? And how can she even pretend she is ready to dance next week at an Irish dance competition (feis) in County Sligo, Ireland?...