Struggling author Richard Madoc visits Erasmus Fry, an elderly former writer who has imprisoned a Greek muse named Calliope in his house. Fry transfers ownership of Calliope the Muse to Madoc, who discovers that by raping her, he receives inspiration. He does this more than once, despite his promises, until it becomes obvious he never intends to let her go. Calliope sends a desperate plea to Morpheus, her former husband, who she has not seen since the tragic passing of their son Orpheus. Upon receiving her plea and learning of what has happened to her, Morpheus becomes enraged and confronts Madoc. When he refuses to release Calliope, Morpheus punishes Madoc with an uncontrollable stream of ideas. Madoc soon frees Calliope, who asks Morpheus to lift his curse of Madoc. Morpheus lifts the curse of too many ideas, but Madoc finds himself unable to remember Calliope, Morpheus, or any of his ideas. Calliope vows to make sure what happened to her doesn't happen to anyone else. She and Morpheus share a tender goodbye with her expressing hope that sometime in the future, she can visit him in his realm and they'll be able to grieve their son properly.
In 1916, Morpheus, the king of dreams and one of the seven Endless, is captured in an occult ritual. After being held captive for 106 years, Morpheus escapes and sets out to restore order to his kingdom of the Dreaming. He attempts to mend the cosmic, and also very human mistakes he has made during his long and vast existence.