How deeply the relationship between mother and daughter can change, in his next psychological novel Master Detectives Agatha Christie. Ann Prentice falls in love with Richard Cauldfield and hopes for new happiness. But her only child, nineteen -year -old Sarah, is absolutely against it and consistently destroys all the chances of a possible marriage. Their deep love is alternated by the same intense hatred. A hostile is jealousy for a lifetime, or can each other forgive?