Samira Ahmed visits the major new Barbara Hepworth exhibition that features some of her most significant sculptures in wood, stone and bronze, alongside rarely seen textiles, photographs, collages and film. Samira talks to its curator, Penelope Curtis, whose last last show as director of Tate Britain this is.

The CILIP Carnegie and Kate Greenaway Medals are the awards that authors and illustrators say they 'most want to win'. Both are awarded by children's librarians for an outstanding books for young people: one for the story the other for the illustrations. We speak to this year's winners, Tanya Landman and William Grill, both of whose books take historical subject matter, Shackleton's expedition to the Antarctic and the American South immediately after the Civil War.

Going Clear is a new film about scientology by documentary director Alex Gibney. It is based on Lawrence Wright's book by the same name and Gibney speaks with former leaders and defectors of the church. Tim Robey reviews.

Nell Zink used to write just for herself, sometimes sending her stories to a pen-pal, until she entered into a chance correspondence with Jonathan Franzen who encouraged her to publish her fiction. Her first book, The Wallcreeper, was named one of the100 notable books of 2014 by The New York Times. She talks to Samira about her second novel, Mislaid, which explores race and identity in rural Virginia. Show less