Flowers For Your Grave is one of Castle's bestselling novels written in the years before he met Beckett. It gives its title to the pilot episode of the series, as the reason for Castle and Beckett meeting is that a killer recreates the murder depicted in the book, and Beckett is assigned to investigate it.. It is one of Castle's 'standalone' novels, not part of the Derrick Storm series. Although referenced in the show, it has never been made available in the real world.
(From richardcastle.net) Four murders in and the NYPD are still desperate for a lead on the serial killer that the tabloids are calling ‘The Florist.’ Struggling journalist Leroy Fine knows if he cracked this story he could get back everything he’s lost – his job, his wife, his self-respect. So when Leroy uncovers a piece of evidence the cops have overlooked, he begins his own private investigation into the twisted and deadly world of The Florist. But as Leroy gets closer to discovering the killer’s identity, he soon realizes he’s put himself and everyone he loves in mortal danger. Now Leroy must decipher the Florist’s riddles and unmask his identity… or end up the latest flower-covered corpse on the Ledger’s front page.
References in Episodes
Flowers For Your Grave (episode 1.1) – 1st murder victim from book, Kyle's apartment