The Girl in the Green Glass Mirror is about romance, melodrama and art. Catherine Sergeant is a fine-art auctioneer whose life changes when her quiet, repressed husband abruptly walks out without a word to Catherine. The two later are in touch when he serves divorce papers on her.
Catherine does not lick her wounds for long. She meets retired architect John Brigham. He is twenty years senior to Catherine, but age does not matter to them. They share a fascination with the work of artist Richard Dadd, an early Victorian painter who was mentally ill and murdered his father. Dadd spent most of his life in an insane asylum, and his best works were created during that time.
John shares a secret with Catherine. He is the holder of several Dadd paintings and drawings. John and his deranged sister, Helen, are co-trustees of several Dadd paintings and drawings which they inherited from their parents. John and Helenís great grandfather was Daddís caretaker in the insane asylum, and Dadd created several pieces of art for him. Catherine is beside herself over this wonderful discovery; she believes that the artwork should be shared so the public can enjoy it. But Helen - bipolar, penniless, jobless Ė wants to sell it.
Interspersed with Catherine and Johnís romance are flashbacks to the 1800s when Dadd is in the insane asylum, flashbacks that are primarily Daddís musings and observations as the years pass. Helen provides the melodrama for the story, as does the breakup of Catherineís marriage and Johnís health. The Girl in the Green Glass Mirror is carefully written, intricate and lyrical, celebrating art and love and showing that the world is incomplete unless both are present in oneís life.