To the Great Deep (A MERLIN MYSTERY)

When Sir Agravain leads a dozen knights to arrest
Lancelot in the queen’s chamber, he kills them
all in his own defense—all except the villainous
Mordred, who pushes the king to make war on the escaped
Lancelot, and to burn the queen for treason. On the morning of
the queen’s execution, Lancelot leads an army of his supporters to
scatter King Arthur’s knights and rescue Guinevere from the
flames, leaving several of Arthur’s knights dead in their wake,
including Sir Gawain’s favorite brother Gareth. Gawain, chief
of what is left of the Round Table knights, insists that the king
besiege Lancelot and Guinevere at the castle of Joyous Gard,
goading Lancelot to come and fight him in single combat.
However, Merlin, examining the bodies on the battlefield,
realizes that Gareth and three other knights were killed not by
Lancelot’s mounted army but by someone on the ground who
attacked them from behind during the melee. Once again it is
up to Merlin and Gildas to find the real killer of Sir Gareth
before Arthur’s reign is brought down completely by the warring
knights, and by the machinations