One plot involves the kidnapping and ransoming of VIPs by a highly professional couple. The Secret Service are completely flummoxed as to who the kidnappers are but suspect they are planning their big job. Indeed, they kidnap the Archbishop of Canterbury and want a fortune in diamonds for his release.
The other plot involves a medium and her lover / assistant who are employed by a rich older woman to find her long-lost nephew. Trying to find this nephew is very difficult but they finally do succeed... but you can guess who it turns out to be!
A good book, a slow start is ultimately very rewarding. The characters are well written and the demise of one of them hits hard. The book ends on a pretty dark note as well. Interestingly, the story was adapted into a film called Family Plot, which was Alfred Hitchcock's last film.












