Nathan Fillion and Stana Katic star as Richard Castle and Kate Beckett, the mystery crime writer turned sleuth and New York detective, in the explosive new season of the top-rated US crime drama.
The hit crime procedural continues with more all-new episodes from series seven.
It's back! Castle returns for its new and exclusive seventh series on Alibi.
Whether your favourite is Backett, Castle, Ryan or Martha, find out what makes them tick.
Are you a loyal Castle viewer? Take our quick-fire quiz to find out how much you know.
Follow the action from the brand new series with our quick guide.