An unusual explorer named Gum (Richard Griffiths) and his kindly niece (Emilia Fox) adopt three orphans -- Pauline (Emma Watson), Petrova (Yasmin Paige) and Posy (Lucy Boynton) -- and raise them as sisters in 1930s London. But the girls must fend for themselves when Gum doesn't return from one of his adventures. Together, they nurture their passions for acting, aviation and ballet in this charming TV adaptation of Noel Streatfield's novel.