Penny is threatening to cancel Miranda's Christmas if she does not sort her life out. Amongst other things, she forces her daughter on a detox. Stevie has a new executive job and Miranda tries to follow her into an office job, but it all proves too much. Meanwhile, are Gary and Miranda able to just be friends?

Miranda has decided to prove to herself and her friends that she can officially be an adult. She starts by looking after a toddler, but the soft play centre is too much of a lure and she gets stuck in a kids' tunnel. She then hosts a dinner party for eight, which ends in inevitable chaos.