DC job offer. The episode ends before she answers. At the beginning of the first sixth-season episode, "Valkyrie", Kate accepts. They are finally married during the seventh season in a private wedding with their family, taking place at Castle's house in the Hamptons. In the eighth and final season, Beckett estranges herself from Castle in order to protect him from LokSat, a deadly mastermind who she's after, although they are married still and very much in love. Beckett starts living elsewhere, not letting Castle know about LokSat. After the events of "Mr. And Mrs. Castle" they get back together. Alexis becomes Castle's main helping hand in his P.I. agency. In the series finale, a flash forward to seven years later shows Castle and Beckett are the parents of three children. Writing career Early episodes of the series had Castle voicing over the introductory credits beginning with Season 2. There are two kinds of folks who sit around thinking how to kill people: Psychopaths, and mystery writers. I'm the kind that pays better. Who am I? I'm Rick Castle... Every writer needs inspiration, and I found mine." [Det. Kate Beckett as Nikki Heat] "And thanks to my friendship with the mayor, I get to be on her case... And together, we catch killers." Castle is an author of mystery fiction, with 26 bestsellers. His first novel, In a Hail of Bullets, accrued at least 21 rejections before being accepted by a publisher (he keeps the first rejection letter he received framed on his office wall as motivation) and winning the Nom DePlume Society's Tom Straw Award for Mystery Literature. The books have made Castle wealthy; when Alexis is kidnapped he can pay a $3 million ransom. Castle has a large multi-floor Manhattan apartment, a beachfront house in the Hamptons, and luxury cars. His most popular works are a series starring "Derrick Storm"; A Calm Before The Storm, Gathering Storm, Unholy Storm, Storm's Last Stand, Storm Season, Storm Rising, Storm Warning, and Storm's Break and in the pilot episode, Castle attends a party for the release of the final book in the Storm series, Stormfall, which ends with the surprise death of Derrick Storm, Castle having become bored with the character. He later reads from the novel before a book-signing. Patterson and Cannell both disagree with the decision to kill off Storm, with Cannell commenting that he could have retired or crippled