Rinnie requires a copy of the book History of the Unicorn Run to write a ballad. The closest copy is at the top floor of Ramazith's Tower, in the same area as Rinnie (North Baldur's Gate), and another one in the city can be found in Tremain Belde'ar's Home ground floor (West Baldur's Gate). Rinnie's Home (1200,2800) is located next door to the east of Petrine.
Upon completion of the quest the party will be rewarded with one of two outcomes depending upon her reaction to the party.
Reaction ≤14: 900 XP and 80 
Reaction ≥15: 900 XP and an (unidentified) Scroll of Protection From Poison
| “ | "History of the Unicorn Run..." How wonderfully ideal! You wouldn't believe how grateful I am to get my hands on this. Here, a friend of mine gave me this magical scroll and I have yet to make use of it. | ” |