Ronnie packs her bags as DCI Marsden, who's recovered nicely after being elbowed in the yapper by the former, claims to be closing in on Archie's murderer. Marginally elsewhere, Jack gives Bradley a deadline to tell the police what he knows - or he will. Meanwhile, the Square prepares for Dot and Jim's surprise party and Zainab helps Ricky arrange a romantic meal for Bianca, leading to a wee revelation about the hen night chicanery.