[4] In 2001 Klass published You don’t know me, which uses an edgy first-person narrative to tell the story of a teenage boy’s life with an abusive stepfather-to-be.

Whirlwind, the second book in the Caretaker Trilogy, tells the story of Jack’s efforts to save the Amazon rain forest; published in March 2008 by Farrar, Straus and Giroux.

[6] Out of Time is an adult novel about a talented young FBI agent in pursuit of an ecoterrorist. Klass has also written more than 40 Hollywood screenplays, including the adaptation of James Patterson's Kiss the Girls for the movie version starring Morgan Freeman and Ashley Judd.

[13] Klass wrote the screenplay for the thriller Desperate Measures starring Michael Keaton and Andy García, which was based on his original idea.

[14] With his sister, playwright and Truman Scholar[15] Judy Klass, he adapted Julia Alvarez's novel In the Time of the Butterflies into the 2001 movie starring Salma Hayek and Edward James Olmos.