Logno, was an important Honored Matre during the events of Chapterhouse: Dune. She was the chief advisor to the Great Honored Matre Dama, and often argued with her on certain matters, due to Dama's weird behavior and attitudes, and after having the former poisoned, she took the post of Great Honored Matre.
Dama ordered Logno to investigate more about "The Weapon" and see if the Ixians could duplicate it. Logno informed Dama they were unable to do it. It was during that meeting when she realized that Dama enjoyed having sex with futars, and also realized that this Great Honored Matre had done many things her predecessors had rejected.
During the interrogation of the Jewish woman (and wild Reverend Mother) Rebecca, Logno wanted to kill her, as many of the Honored Matre's council, however, Dama, whose autocratic style always prevailed, order Logno not to do so, but "let the crab leave".
When the Bene Gesserit Mother Superior Darwi Odrade, accompanied by a delegation of the Bene Gesserit conformed by Tamalane, Dortujla and Suipol, arrived on Junction to offer the Honored Matres the surrender of the Sisterhood, Dama ordered to her guards and advisors to leave the place where she and Odrade would discuss certain facts of the surrender. While that happened on Junction, the Bene Gesserit Supreme Bashar Miles Teg attacked Gammu with the Sisterhood's forces. On Junction, Logno assassinated Dama with poison (as she had already planned), assumed control of the Honored Matres, and immediately surrendered. This surprised Darwi Odrade, but she and Miles Teg soon realized they had fallen into a trap. The Honored Matres deployed "The Weapon" and turn defeat into victory, destroying a great part of the Bene Gesserit's forces.
In a desperate last gamble, Murbella landed on the planet, declared her hostility towards the Great Honored Matre in front of an Honored Matre named Elpek, and was taken to Logno who, unable to help herself, attacked Murbella, who killed her and took command of the Honored Matres, who were awed by her physical prowess. In the melee Elpek killed Odrade, and thought Murbella would spare her life, but the enraged new Great Honored Matre and Mother Superior of the Bene Gesserit, after seeing Odrade's dead body, killed Elpek instantly.