Advice for a happier life is found in so-called ‘self-help books’, which are widely sold in modern countries these days. These books popularize insights from psychological science and draw in particular on the newly developing ‘positive psychology’. An analysis of 57 best-selling psychology books in the Netherlands makes clear that the primary aim is not to alleviate the symptoms of psychological disorders, but to enhance personal strengths and functioning. Common themes are: personal growth, personal relations, coping with stress and identity. There is a lot of skepticism about these self-help books. Some claim that they provide false hope or even do harm. Yet there are also reasons to expect positive effects from reading such books. One reason is that the messages fit fairly well with observed conditions for happiness and another reason is that such books may encourage active coping. There is also evidence for the effectiveness of bibliotherapy in the treatment of psychological disorders. The positive and negative consequences of self-help are a neglected subject in academic psychology. This is regrettable, because self-help books may be the most important—although not the most reliable— channel through which psychological insights find their way to the general audience.