On July 3, 2011, Passion qualified the Fallen books for the Series section of the New York Times Bestseller List it entered the list at number 2, behind the Hunger Games books. On June 23, Passion reached number 7 on the USA Today Bestseller List, for books overall. A new edition of Natalie Hargrove was also released on the same day as the paperback edition of Torment. The third book in the Fallen series, entitled Passion, was released on June 14, 2011. The paperback edition of Fallen debuted at number 1 on the list, as well. It debuted at number 1 on the New York Times Bestseller List ( Fallen came in that week at number 2), remaining at that position through the week of October 17. Torment, the sequel to Fallen, was released on 28 September 2010.

Her standalone novel The Betrayal of Natalie Hargrove, released, November 12, 2009, with her second Fallen, the first in the Fallen series also released that year. The family currently lives in Laurel Canyon, Los Angeles. They have a daughter, named Matilda (born February 2013) and a son, named Venice (born June 2014). Kate married Jason Morphew, a singer-songwriter, in 2009. She had gotten the idea for the series from a line in Genesis that she came across whilst studying the Bible in graduate school in California. The Fallen series employs Kate's many months of theological research. In fact, she based the high school setting of The Betrayal of Natalie Hargrove on the Dallas high school she attended (Plano senior High School).

Kate has stated that her high school did not provide the basis for Sword and Cross in the Fallen series. Kate has stated that experience of the 'Old South' in the Atlanta area inspired her to set Fallen in a Civil War era academy.

Kate was raised in Dallas, Texas, and has a master's degree in fiction from the University of California.

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