Nathan Fillion

CASTLE — "Flowers for Your Grave" — In the premiere episode of ABC’s new midseason series, "Castle," a wildly famous mystery novelist, Richard Castle (Nathan Fillion, "Desperate Housewives"), who is bored with his own success, learns that a real-world copycat killer has started staging murders from scenes depicted in his novels. Castle is questioned by NYPD Detective Kate Beckett (Stana Katic, "The Spirit"), a bright and aggressive detective who keeps her investigations under a tight rein. Though they instantly clash, sparks of another sort also begin to fly, leading both to danger and a hint of romance as Castle steps in to help find the killer. "Castle" premieres MONDAY, MARCH 9 (10:02-11:00 p.m. ET) on the ABC Television Network.

Authors James Patterson and Stephen J. Cannell guest star as themselves in a poker game. (ABC/ERIC LIEBOWITZ) STANA KATIC, NATHAN FILLION