In Dune: House Corrino (published in 2001 and the third novel in the Prelude to Dune prequel series by Brian Herbert and Kevin J. Anderson), Piter De Vries discovers the Harkonnen heritage of Lady Jessica and her newborn son Paul, and attempts to kidnap and ransom the infant. The plot is thwarted and the secret preserved - the Reverend Mother Gaius Helen Mohiam kills the Mentat and arranges for his corpse to be shipped home to Giedi Prime. An enraged Baron is left with no choice but to order a duplicate from the Bene Tleilax: the Mentat De Vries featured in Herbert's original novel Dune.
Read more about this topic: Piter De Vries