Bertie and the Alien Chicken

Bertie is NOT looking forward to spending the summer holidays on stinky Long Bottom Farm. But things take an interesting turn when he encounters Nugget, the alien chicken.Nugget's mission is to find the Earth's most valuable resource and transport it back to Nurgle 7, and he needs Bertie's help.But what could the Earth's most valuable resource be, and can they find it in time to stop the Nurgles exterminating the Earth?!