Castle The Complete Fourth Season DVD set brings back the charismatic mystery novelist Richard Castle and NYPD homicide detective Kate Beckett for another round of thrilling investigations and romantic tension. This ABC Studios production includes all 23 episodes from the fourth season, following the aftermath of the dramatic season three finale. Viewers can enjoy the blend of procedural crime-solving, witty banter, and the evolving partnership between the lead characters. The set typically includes bonus features such as deleted scenes, bloopers, and behind-the-scenes featurettes for a comprehensive fan experience.