There are a number of inheritors to a fortune who are getting killed by a mysterious somebody whom we do not see. Each death is novel, but not terribly graphic. Who did it?
Tom Drake
Inspector Greville
Femi Benussi
Simone Marot
Virgilio Gazzolo
Commissioner Etienne
Ivo Garrani
Leon
Ernesto Colli
Janot
Valeria Ciangottini
Colette Marot