Kathy and Jennifer Finch might be twins but their looks are the only thing they've got in common. Kathy has pulled herself up by her bootstraps, becoming a midwife and helping women such as Ruby Potter, terrorized by her brutal husband, Charlie. Meanwhile, sly and mouthy Jennifer has ended up in the gutter, sucked into a sordid life of prostitution and crime. However, it isn't just Ruby that Kathy needs to worry about. Jennifer has managed to get herself into even more trouble - of the worst kind - and if Kathy ever finds out why, it will finish off what's left of their sisterly love for good ...