Castle (television) ABC television series, premiering March 9, 2009 and ending May 16, 2016. Famous mystery novelist Richard “Rick” Castle is bored with his own success, but when a real-world copycat murderer starts staging scenes from Rick’s novels, he is teamed up with NYPD Detective Kate Beckett to help solve the crime. Rick and Beckett’s styles instantly clash and sparks begin to fly, leading both to danger and a hint of romance. Stars Nathan Fillion (Rick Castle), Stana Katic (Kate Beckett), Molly Quinn (Alexis), Susan Sullivan (Martha), Monet Mazur (Gina), Ruben Santiago-Hudson (Capt. Montgomery). Produced by ABC Studios.