Depression is one of the deadliest diseases on the planet. As the population of depressives in modern society increases year by year, the majority still hold prejudices against depression. What on earth is depression? How can we cope with it? By means of self-analysis, the author of this book, Matt Haig, wrote about his feelings after suffering from depression. Through his personal experience, he presented the inner world of depressives and their journey of self-help to combat depression.