Go back in time with No 1 bestselling author David Walliams for a whizz-bang epic adventure of action laughter & secret plots &8211; & the extraordinary friendship between a little boy & a huge gorilla that just might save the day&8230;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 & there&8217;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&8230; Join David Walliams on this action-packed laugh-out-loud adventure for all the family!