Gnomeo and Juliet are waiting for a new exciting adventure - now in huge London. When heroes with families and friends move to the city, their main concern is to prepare their new garden by spring. But soon they gain the disturbing news: their fellow gnomes are mysteriously disappearing all over London! And then one day Gnomeo and Juliet, returning home, discover that all their relatives have disappeared. In such a situation, only Sherlock Gnomes can come to the rescue. A well-known detective rallies to the defense of the inhabitants of London gardens and, with the help of his faithful companion Watson, undertakes to uncover an intricate case.