Poison shadows

The story follows a circle of characters whose designs on an heiress and a valuable estate uncover darker currents: a scheme to force an advantageous marriage, a neglected country house linked to sudden deaths, and the discovery of a rare Venetian manuscript detailing secret poisons. Investigations and clandestine enquiries escalate into a wider conspiracy that combines scientific curiosity, toxicology, and shadowy international intrigue, leading the protagonists from English drawing rooms to distant mountain realms, wireless communication, and uncanny episodes involving rejuvenation and esoteric cult references before reaching a decisive resolution.