Report for Murder by Val McDermid

Freelance journalist Lindsay Gordon is strapped for cash. Why else would she agree to cover a fund-raising gala at a girls' public school? But when the star attraction is garrotted with her own cello string, mere moments before she is due on stage, Lindsay finds herself investigating a vicious murder. Who would have wanted Lorna Smith dead? Who had the key to the locked room in which her body was found? Who could have slipped out of the hall at just the right time to commit this calculated and cold-blooded crime?