Report for Murder (A Lindsay Gordon mystery) by Val McDermid

Lindsay Gordon, self-proclaimed cynical socialist lesbian feminist journalist is less than overjoyed at the prospect of spending a weekend at a posh girls' boarding school. Tensions are running high over the school's financial problems; the fact that school alumna and reknowned musician Lorna Smith-Couper, will return to the school to perform at a benefit concert only exacerbates anxieties. When Smith-Couper is found strangled with her own cello string right before the concert, Lindsay and Cordelia find their new relationship tested in unique ways as they seek to find the murderer among a long list of suspects.