The trick with mirrors

Miss Marple still can not sit quietly in her comfortable home in the village of St Mary Mead. This time she decided to participate in the fate of her old friend Carrie-Louise. The fact that, firmly convinced of their mutual friend, Ruth van Rydock, unhappy in danger of death from poisoning. No evidence no, but Mrs. van Rydock convinced of the seriousness of the threat. Upon arriving at Carrie-Louise and her husband, miss Marple found their numerous relatives, very difficult in terms of relationships. No sooner had the lady detective how to get comfortable in a new place, I became a witness to a crime is one of the family members was shot dead under the most mysterious circumstances. Thus, miss Marple will have to investigate two cases - about the murder and about possible poisoning; and, at first glance, no connection between them...