Sebastian Fitzek is the most successful German bestselling author, whose works have sold more than 19 million copies and have been published in more than 36 countries. He began his career in radio, later studying law and gaining a doctorate in copyright law. In 2006, he published his first psychological thriller, Therapy, which became a bestseller, as did all subsequent books. Between 2014 and 2021, Sebastian Fitzek was the most successful German author of the year six times. In 2023, his books The invitation and Parent’s Eve were the bestselling books of the year. Many of his books have been successfully adapted for film and television series, such as Therapy (Prime Video) as a six-part miniseries, which was a TOP 10 hit in 17 countries for several weeks. Also, many of his works have been the subject of several theater adaptations, including Soulbreaker, Therapy and Passenger 23. Sebastian Fitzek has twice been nominated for the Glauser Prize and has been awarded the Golden Lovelybooks Readers' Prize several times. He also received the Hörkules and won the European Prize for Crime Literature in 2016. He is an ambassador for the German Child Protection Association and patron of the association Das frühgeborene Kind e.V. Fitzek was born in Berlin in 1971. He lives with his family in Berlin.

Ari Fliakos is a core member of the Wooster Group, developing original work with the company since 1998, including: Symphony of Rats, A Pink Chair, Vieux Carre, Hamlet, The Room, Poor Theater (for which he won an Obie), House/Lights, and To You: The Birdie!

Ari has narrated books by John Updike, John Grisham, Jodi Picoult, Jonathan Safran Foer, Richard Price, and James Patterson. He was named Audible's Narrator of the Year in 2017 and narrated 2016’s Audiobook of the Year, The Nix, by Nathan Hill.

TV/film includes Homeland, FBI, New Amsterdam, Mysteries of Laura, Company K, and Limitless.