You are scrolling before bed and a post stops you cold. Something someone said, something done to someone else, something that is wrong. Your chest tightens, your jaw sets, and an hour later you are still awake, drafting replies to a stranger you will never meet, carrying on a fight that was never yours.

This is the texture of modern life, and George Dieter has spent his career explaining why it leaves us so depleted. Somewhere along the way of our life, mostly during childhood or adolescence, we learned to take responsibility for feelings, moods, and problems that belong to other people, and to hand other people responsibility for ours. We crossed a line we cannot see, and now we wonder why we feel so stressed, so resentful, and so out of control.

Drawing the Line is a psychologist's guide to finding that line and holding it. Dieter's central idea is this: you are not responsible for how other people feel, and no one can make you feel anything. The distress that fills our days and steals our sleep, the anxiety, resentment and the relationships that turn into battlegrounds, all come down to a single confusion: mistaking what belongs to someone else for something you must carry.

What sets this book apart is where Dieter looks for the explanation. In the first half of the book, he starts with the brain itself: explaining how the brain evolved, why fear sits underneath almost every difficult emotion, and how stress is really energy that has to be funnelled somewhere. Once you understand this machinery, boundaries stop being a vague wellness idea and start making sense.

In the second half, Dieter applies what he calls a boundary focus to the situations that cause the most grief: relationships that feel like contests rather than partnerships, families that pull you back into old versions of yourself, the workplace, anger, and the exhausting belief that everyone's happiness rests on you. He closes with practical ways to release the energy that builds up when boundaries are crossed, including the chapter he only half-jokingly calls the panacea of sorts, on the simple necessity of real time for yourself.

This edition arrives at a moment that makes the argument more urgent. We now live with artificial intelligence, deepfakes, fabricated quotes, and a feed engineered to provoke a reaction, all of it competing for a nervous system that has not changed in hundreds of thousands of years. In a world that often feels as though it is spinning out of control, the ability to recognise what is yours to carry and what is not is no longer a nicety. It is how you stay sane.

Straightforward and entertaining, Drawing the Line is for readers who loved the practical clarity of Why Has Nobody Told Me This Before? and the acceptance taught in Set Boundaries, Find Peace, who want to understand not just what to do but why it works. It is a book for anyone who has ever felt like too much, done too much, and lost track of where they end and everyone else begins.