The Mirror of Her Dreams is a novel by Stephen R. Donaldson published in 1986.
The Mirror of Her Dreams is a novel in which the setting is a world on which the mirrors are magical, and is the first novel in the Mordant's Need series.
[1] Dave Langford reviewed The Mirror of Her Dreams for White Dwarf #82, and stated that "It kept me turning the too many pages, though I couldn't believe the Marvel Comics SF megawarrior, or the Feydeauesque scenes in which an ambiguous mage keeps unbuttoning and stroking our heroine's bosoms but never gets any further.
"[1]