Merlin can do little to help when Morgause uses a 'glamour' to lure Arthur into a potentially deadly confrontation.

The prince settles a debt. Oneshot sequel to "No Stone Unturned." Contains spoilers so please don't read unless you've already read that story.

Gaius and Arthur are baffled when Merlin vanishes without a trace, and Merlin's survival depends on an adversary from the past.