Question: Who's the husband of the writer of The Unknown?

<P0-S0> Violet Emily Wegner, (1887-1960), was the daughter of an Extradition Department detective of Scotland Yard, William T. Wegner, and Arabella Eliza née Darby, who resided in a district of London called Tulse Hill. <P0-S1>  Violet made a career in the music halls from the age of 15. <P0-S2>  She became known as the "Idol of Berlin". <P0-S3>  In 1912, Violet married her first husband, Sergio Francesco Enrico Maria Brunetta d'Usseaux (born 3 March 1885, Torino, Italy), in London. <P0-S4>  Sergio's parents were Comte Eugenio Brunetta d'Usseaux and the Russian Countess Zeiffart. <P0-S5>  Eugenio was Secretary General of the Olympic Committee that administered the 1908 London Olympics. <P0-S6>  Eugenio died in 1919 in mysterious circumstances. <P0-S7>  The fate of his son, and Violet's husband, is also unknown although it is suggested he may have been the son Eugenio was trying to reach following the October Revolution. <P0-S8>  Whilst traveling in Italy during 1918, Violet met the youngest son and royal prince, Pierre Petrović-Njegoš, of the exiled King Nicholas I of Montenegro. <P0-S9>  After some delay, it is said, at the behest of Violet's mother who advised them to await the award of monies claimed by the prince from the new Yugoslav government for the confiscation of his family's property in Montenegro, Violet married Prince Pierre (Peter) of Montenegro in Paris in the April of 1924. <P0-S10>  Violet then became HRH Princess Pierre of Montenegro and thus sister-in-law to Queen Elena of Italy as well as a host of other European princes and kings via her husband's siblings. <SEP> <P1-S0>  It is narrated by Cassie. <P1-S1> The Unknown is the 14th book in the Animorphs series, written by K.A. Applegate. <P1-S2>  The front cover quote is, "Never underestimate the power of a morph...". <P1-S3>  All books after "The Unknown" were dedicated to Applegate's son, Jake, as well as her husband and co-writer, Michael. <SEP> <P2-S0> Animorphs is a science fantasy series of young adult books written by Katherine Applegate and her husband Michael Grant, writing together under the name K. A. Applegate, and published by Scholastic. <P2-S1>  It is told in first person, with all six main characters taking turns narrating the books through their own perspectives. <P2-S2>  Horror, war, dehumanization, sanity, morality, innocence, leadership, freedom and growing up are the core themes of the series. <SEP> <P3-S0> Rakt Sambandh (Hindi: रक्त सम्बन्ध, English: "Blood Relations") is a multi-star cast thriller show. <P3-S1>  "Rakt Sambandh" aired on Monday 19 July 2010 on NDTV Imagine. <P3-S2>  A visually impaired young woman with the help of four supportive elder sisters and a loving father has overcome her difficulties to lead a normal life. <P3-S3>  But life takes a different turn, when she finds her father dead under mysterious circumstances on her wedding day. <P3-S4>  With the affection showered by her husband Yuvraj and his family, Sandhya begins to smile again… but not for too long. <P3-S5>  Unknown to her, Sandhya's new family have a deep, dark secret… How will she react when she discovers the truth about her husband?