Go back in time with 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 ...