'[A] well-researched and highly fact-based read'.

– The Glass House

'A really cleverly packaged, quite brilliant idea... the ultimate end of January read'

– Alexandra Heminsley, Radio 2

'Entertaining and informative'

– Press Association

‘Rather good.. may entice you into reclaiming your dark side’

– The Times

‘A new way of thinking’

– The Sun

'The perfect manual for someone waking up on a January morning’

– Independent on Sunday

‘A highly refreshing alternative to the idea that one must pursue happiness at all costs.’

– Kelly McGonigal, author of The Willpower Instinct

'Essential reading for anyone who wants to understand the hidden elements of a happy, fulfilling, engaged life.'

– Gretchen Rubin, bestselling author of The Happiness Project

‘I feel like I have five new superpowers after reading this book. The dark side does indeed have an upside – and this book teaches us how to harness it, so we can truly lead more heroic and purposeful lives.’

– Jane McGonigal, author of Reality Is Broken

‘With verve, humour, solid research, and lots of examples, the authors cut through prevailing myths about happiness to show what actually creates a fulfilling, contributing life. Brave, bold, and brilliant.’

– Rick Hanson, author of Buddha’s Brain

‘At long last, here’s a book on why happiness can make us sad and mindfulness might be overrated. If you haven’t read it yet, you should feel guilty – and it turns out that will be good for you.’

– Adam Grant, author of Give and Take

‘Full of scientific research yet laugh-out-loud funny, this book is a must read. The authors turn everything on its head – questioning the wisdom of positive psychology and the pursuit of happiness – all in order to help us flourish and be happy!’

– Kristin Neff, author of Self-Compassion