To Kill the King

When Gwen's father is imprisoned for treason and killed at Uther's behest, Morgana decides she must take revenge.Merlin is stunned to discover just how far she is prepared to go when he uncovers a plot to kill the King. Can the young sorcerer summon the courage to foil her plan, or is this one occasion when he should just sit back and do nothing? After all, his life would be much simpler were Uther not around.