All the Colours of the Dark

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 DrakeInspector Greville
Femi BenussiSimone MarotV Virgilio GazzoloCommissioner Etienne
Ivo GarraniLeon
Ernesto ColliJanot
Valeria CiangottiniColette Marot
Isarco RavaioliJules Didier
Giovanna LenziRosalie
Andrea FantasiaNotaio
Alessandra MaraviaNatalieA Arnaldo De AngelisOscar MarotA Aurelio MarconiUsuraioProduction information and reference links
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