Mariella Frostrup asks what it takes to write a compelling diary. She discovers more about the diaries of Virginia Woolf, Anne Frank and Adrian Mole through meeting Virginia Nicholson, Jacqueline Wilson and Sue Townsend. In seeking to find out what separates a simply dedicated diarist from a great one Mariella travels to Charleston to meet Virginia Nicholson, the grandniece of her favourite diarist, Virginia Woolf. Despite leading inexorably towards her taking her own life, Woolf's diaries are surprisingly funny, and their immediacy and humanity pulls us into her world. Teenage is a time when many commit their most intimate thoughts to their diary, though few continue into adulthood. Mariella visits Jacqueline Wilson to talk about the teenage diary - often silly, full of self-obsession and lacking in irony. In fact, the former children's laureate describes her own teenage diary as written by 'such an idiot'. But Jacqueline is in awe of the skilled teenage writers who use their diary as confidante to create something resonant and lasting and admits to a lifelong obsession with Anne Frank. Anne Frank couldn't possibly know the end to her story as she wrote. But is there a reader who comes to her diaries without the added poignancy of the tragic end colouring how they respond to every entry? The importance of a diary's detail and honesty come to dominate Mariella's trip to Leicester to see Sue Townsend. They discuss whether a fictional diary can possibly be entirely fictional, and Sue confesses that there are more similarities between her and her diary-keeping creation, Adrian Mole, than one might imagine. Contributors include Eileen Atkins, Hermione Lee, Deborah Bull, Kathy Lette, Gyles Brandreth, Ellie Kendrick, Simon Brett, John Lahr and Simon Garfield.