Allen Carr was a British accountant who smoked heavily until 1983, when he quit and built the Easyway method around what he had worked out. This book applies that method to alcohol. It argues that people keep drinking because they believe alcohol gives them pleasure or a crutch, and that willpower fails because it leaves that belief in place. Carr names a little monster, the physical pull, and a big monster, the brainwashing, and sets out to remove the illusions so that stopping feels like relief rather than sacrifice. Readers are asked to keep drinking until they finish the book, and the argument works through the reasons drinkers give themselves, one by one.
Most ways of stopping ask you to hold out. Carr's argument is that holding out keeps the problem alive: if you still believe a drink relaxes you, cheers you up or gets you through, then every evening without one feels like a loss. Take away the belief, and there is nothing left to resist.
So the book does not ask you to stop straight away. It asks you to read with an open mind and test each thing you think drinking gives you. In Carr's account, once those illusions are gone, stopping is easy and immediate, and you are free from the final drink rather than months later.
This is Carr's view, not settled science. Evidence for the Easyway method is limited, especially for alcohol, so treat it as one approach among several and talk to a professional about what suits you.