The Lock Keeper's Inn outside Belfast is an attractive but otherwise unremarkable café. Serving up the usual Northern Irish fare of sausage rolls and stew, it's a place to stop for a quiet coffee after walking along the nearby riverbank. A world away, it would seem, from the bitter feuds of Northern Irish politics. But following a series of remarkable revelations this week, the inn is at the center of a scandal that could threaten the career of Northern Ireland's top politician. On Thursday, a BBC television program called Spotlight issued a report accusing First Minister Peter Robinson's wife Iris...