Moominmamma joins a club of robbers, but will her unshakeable moral code betray her? After being told that only "rebel fathers" can be admitted to Moominpappa's new club - the Knights of the Catapult - Moominmamma defiantly decides to join a club of her own. Unfortunately for her, she accidentally joins a club of gangsters who revel in dubious and illegal activities. And things only get worse for poor Moominmamma as her wish to be admitted as a club member turns into a diffic