But "The Limey" wasn't all bad news. We learned that Lanie and Esposito are still doing the deed behind our backs, we saw a ridiculously hot Scotland Yard police detective in his skivvies, and we watched a foreign diplomat get arrested for international arms trafficking and abetting the murder of a British citizen.
All in all, "The Limey" was one heck of a fun episode that kept us waltzing around in circles like Nigel Wyndham after a few rounds of scotch.
But, like always, we'll let you be the judge. Was Detective Hunt a suitable temporary Castle replacement, or was the mystery writer's emotional absence just too hard to bear? Tell us your thoughts by rating the episode below!