Audiobook Shield Breaker written by Richard Cullen. Styrkar the warrior sails to dangerous lands in this thrilling new adventure from Richard Cullen. Following William of Normandy's invasion of England, the remnants of King Harold Godwinson's family have fled to Ireland. Styrkar, Harold's most loyal housecarl, seeks the dead king's older sons there, but finds himself in the midst of a plot to kill Harold's widow and her baby son.