Nineties (Czech: Devadesátky) is a Czech crime television series that serves as a prequel to Případy 1. oddělení.[1][2] The series is based on real criminal cases investigated by Czech Police. Main characters are based on real life investigators and other people.[3] The cases reflect some of the most famous real criminal cases of the modern Czech Republic (Ivan Jonák [cs], Orlík killers).[4] Nineties became most watched Czech TV series since 2004 with average viewership of 2.23 millions viewers older 15 years and with an average audience share of 47.51%.[5]