A Sister to Salome.

When famous opera singer Elinore Duane undergoes an operation on her throat, she has a series of ether-induced visions. In one, she is transported to ancient Rome where she appears as a much-admired woman in love with Paul, a young heretic, and at odds with Lutor, the high priest. To save her love, she poisons Lutor with her ring. After several other visions which involve variations on this love triangle, Elinore awakens to discover that Lutor is actually her doctor, Sascha Jaccard, and that Paul is the son of a friend who has come to visit the recovering prima donna.