Modus

The silent, snow-covered streets of Oslo are a perfect scene of Christmas tranquillity. But over the tolling of bells for the last Sunday of Advent, a black note sounds. A boy's ­body washes up near the shoreline of the city's Aker Bridge. His corpse is bloated by the water, almost unrecognisable. Nobody has even bothered to report him missing. One week later, the bishop of Bergen is found stabb...