Used book – The Unicorn in the Garden, Peter S. Beagle, Brigitte Mariot

He looks like a rhinoceros, walks like a rhinoceros, and – great gods! – smells like a rhinoceros. But he claims to be a unicorn. It's difficult, even for a philosophy professor, to make him see reason... Tired of always seeing the same faces at her receptions, Lady Neville decides to invite Death to what will be the biggest ball she has ever hosted. But Death does not dance with impunity... Lila, Joe Farrell's new girlfriend, is truly extraordinary... especially on full moon nights!