Morpheus grudgingly helps Delirium search for their vanished sibling in the waking world — where a deadly force lurks in the shadows.

To honor a promise to one sibling, Morpheus must shatter a vow to another. In ancient Greece, a wedding-night tragedy turns a son against his father.

Morpheus enlists an expert in the occult to smuggle a deeply personal relic out of Paris — and help him and Delirium find the answers they seek.