A Death at Dinner — A.G. Barnett

When Mary Blake is called to help an old acquaintance who's being blackmailed, the last thing she expected was to find herself in the midst of a murder investigation... again. However, within 24 hours of her taking on the case there is a suspicious death and the staff of the Rudolph Hotel are thrown into chaos before their big Christmas event. With the police unconvinced of foul play, Mary throws herself into the case along with her assistant Dot and her brother Pea, attempting to track down the killer and prove themselves for the new career they have planned.