Sobriety writing has changed a great deal, and the shelf Millie Gooch occupies is the friendly end of it: the handbook rather than the confession, addressed to anyone curious about drinking less rather than convinced they have hit the bottom of something. Our catalogue files The Sober Girl Society Handbook under health and wellbeing, and the title lays out its terms plainly enough.
The word handbook is doing real work there. It signals something to be consulted rather than merely admired, organised around situations any listener will recognise: the wedding, the work drinks, the friend who keeps topping up the glass. Society points at the other half of the proposition, which is company. Gooch narrates the audiobook in person, and that choice tells you the register was always meant to be conversational rather than clinical.