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The collection, published by Mind charity partner Penguin Random House, sees authors including Richard Branson, Arianna Huffington, Matt Haig, Caitlin Moran, Kevin Bridges and Marian Keyes offer their innermost thoughts on what happiness means to them.
Paul Farmer, Chief Executive of Mind says:
"We are delighted this group of talented and inspiring writers have come together to create the extraordinary Dear Stranger for Mind. One in four people experience a mental health problem every year and, as an increasing numbers of calls to our Infoline show, people need Mind more than ever."