Next Door Murder

Mary Fanning is not dead; she's been murdered.
Jessica Flynn is about to exit her apartment as two police officers knock on her door. After a sleepless Friday night, and before the essential morning caffeine dose, she is informed that Mary Fanning, the loud and annoying tenant of 8C, is dead. She soon finds out that her neighbor has been murdered, and to get things even worse, she may be a suspect.
Jessica now must recall everything that happened the night before, cooperate with the insistent Detective Philippa Mortimer, and find time to sleep on top of that. Meantime, she begins to realize the residents of 116 Heinsbury Street are probably not who they seem to be.
Time is running up, well-hidden secrets are exposed, but the original question remains. Who killed Mary Fanning?
A short story by the author of "What's on True Crime Tonight?" Catherine H. Ambrose.