Go back in time with No. 1 bestselling author David Walliams for a whizz-bang epic adventure of action, laughter and secret plots - and the extraordinary friendship between a little boy and a huge gorilla that just might save the day... 1940. Britain is at war with Nazi Germany. Eleven-year-old Eric spends his days at the place that makes him most happy: London Zoo. And there's one animal in particular he loves: Gertrude the gorilla. With bombs falling all over London, Eric must rescue Gertrude. Together with his Uncle Sid, a keeper at the zoo, the three go on the run. But while hiding out at the seaside they uncover a top-secret Nazi plot... Join David Walliams on this action-packed, laugh-out-loud adventure for all the family! Praise for the author: "Dahl finally has a worthy successor" TELEGRAPH "Another triumph for David Walliams. His books are a breath of wonderful fresh air" THE SUN "[Walliams' books] are brilliantly, beautifully and seemingly effortlessly written ... Mr Dahl finally has a worthy successor" TELEGRAPH 'Walliams understands something crucial about children and stories' METRO "A great comic tale... Walliams is a natural wit" EVENING STANDARD "Well written, funny, touching" OBSERVER "A passionate celebration of individuality" TELEGRAPH "Believable characters and a story that's original and intriguing" HEAT "Charming, funny" THE TIMES "Has a lovely, Dahlian fluency to it" TIME OUT