Lindy and the Knight
The 3rd story in the Falling Into College series by Richard Lobinske. The story occurs during early October 1999.
Jane finds Lindy, Quinn's friend from the previous summer, asleep in the living room. After waking up, Trent explains that he and the band found her passed out by the Tank after a gig. Since her ID was missing and nobody left knew where she was staying, Trent brought her home to keep her safe. Lindy is quickly smitten by Trent, resulting in Jane being suspicious of Lindy and Quinn suspicious of Trent.