In the final book of The Merlin Codex, Greek and Celtic myth continue to exist in a kind of vertigo-inducing disharmony. The descriptions are lovely (as they were in the first two books), but the storyline is as elusive as a Will-o-the-wisp.
We finally discover who's been causing the kerfuffle in Ghostland, but that revelation only brings up more questions. Why that particular character? Why do I feel like it was randomly plucked from the mythological grab-bag?
So, to sum up: Ambiguous mythological allusions float past on a sort of poetic promenade and eventually disappear into the fog of a largely amorphous plot.