It's cool to go out on the tatami and defeat your opponent in a fair fight! Especially at the first European Championship in your life! Murka and Kisonka spent a long time preparing for the karate competition... But not for an insidious and sudden attack by unknown people. The black-clad “ninjas” are doing everything they can to make sure the twins refuse to participate in the championship. Fortunately, Murka and Kisonka are not just athletes, they are employees and co-owners of the White Goose detective agency. The girls are as good at unraveling conspiracies as they are at winning sparring matches!