Kacper Ryx is a Polish historical crime novel written by , published for the first time in 2006 by Cracow-based . Novel features many historical characters, including poets Mikołaj Sęp-Szarzyński, Jan Kochanowski and Mikołaj Rej. It also features Jan Zamojski, Jan Tomasz Drohojowski, Zygmunt II August, Mikołaj Rej, Łukasz Górnicki and . Additionally, the important role is played by the legendary character of Pan Twardowski. It met generally positive critical acclaim, resulting in two sequels, (2008) and (2010). The book was read on the Radio Kraków