Sir Lancelot makes a shocking return from the dead and old feelings reignite, making Gwen fight temptation to avoid committing an unspeakable act of betrayal that would destroy the legacy of Camelot forever. With heads and hearts at stake Merlin soon becomes suspicious. Can a man of honour break oaths and defy death or is there something more than meets eye?

"Arthur decides that he wishes to make Gwen (Guinevere) his Queen, and so enlists the help of Merlin in order to have him prepare the proposal. The news rapidly spreads, and Agravaine tells Morgana, who then wastes no time in setting off to find The Dochraid. The Dochraid - a mysterious creature like an old woman - tells her of the parting of the waters. Then, a figure emerges from the gloom, but who is making a return?Meanwhile, Merlin talks to Gaius about how concerned he is about the returning member of Camelot, and he believes Morgana's played a part in who has reappeared. But will she be discovered before time runs out?"