Spy for House HarkonnenEdit
After living many years in the Imperial Chamberlain Aken Hesban's household, Chiara was contacted by House Atreides in order to serve the Ducal concubine Lady Kailea Vernius as Lady-in waiting. Many of the Atreides household suspected that such a renowned matron as Chiara would have left Kaitain for Caladan, especially Thufir Hawat, who tested her, without success.
Once inside Castle Caladan, Chiara continue secretly reported to Baron Vladimir Harkonnen. Her new goal, was to damage the reputation of Duke Leto Atreides. She gained the trust of Lady Kailea, as well as shared her ambitions.
After several years, Kailea became less pleased with her marriage. As House Vernius became a renegade House of the Landsraad, she wanted that their son Victor be appointed heir of the House Atreides, but Leto refused continuously to do that.
When the Bene Gesserit Jessica joined House Atreides in Caladan as second concubine of Leto, Chiara quickly pointed out to Kailea that she and her son may be displaced. Kailea was also aware of an offer of marriage to Leto, extended by Archduke Armand Ecaz for his surviving daughter, Ilesa Ecaz.
This facts weight heavily on Kailea's mind. Chiara guided Kailea into beliving that the only way to future happiness was to kill Duke Leto. Both orchestrated a plot to assassinate Leto in a staged ship crash, by having Chiara placed a large bomb aboard Leto's skyclipper planetary cruising ship.
Plot to Kill LetoEdit
Kailea began an affair with House Atreides ammunition keeper, Swain Goire, and unbeknownst to him, took his key of the Atreides' armnaments depot from his belt clasp. Kailea gave it to Chiara, who takes from the Armory rigged a time bomb, and placed it into Leto's skyclipper. All of Cala City had been abuzz, as Leto had planned for weeks to visit Caladan's Western Continent in the engine-powered dirgible. Chiara notified Kailea that the bomb had been placed on the blimp-like craft before it had departed skyward.
However, Kailea was latter notified by Goire that her brother Rhombur Vernius and her beloved son Victor had accompanied Leto. The explosion and subsequent crash, resulted in the maiming of her brother and the death of her 6-year old son, Victor. Leto had survived.
Deeply depressed, and knowing the her judgment soon awaited her, Kailea summoned Chiara to her bedroom. Confronting Rash-Olin, she quickly realized that she was manipulated by her assistant Chiara, who was actually a spy for House Harkonnen. Before Chiara could defend herself, Kailea plunged a blade she had snatched from Goire minutes earlier, and stabbed her deeply in the heart.