Disguised Murder and Community Spirit in Little Mallow

Two murders, a whole party of suspects wearing disguises, hundreds of questions, and a seaside village full of cake. Community spirit is strong in Little Mallow and everyone seems to be involved - either as one of many witnesses and suspects, an extremely unofficial sidekick, or a supplier of far-fetched theories. But there's only one Student Police Officer Crystal Clere to make sense of it all.
It doesn't help that Crystal is the only person who thinks the crimes are linked, all the main suspects have alibis and Crystal isn't excused cake baking duties. She's being asked questions by everyone from precocious schoolboy Adam to Arnold the enigmatic verger, and nobody is giving her answers. Then there's Crystal's crush on the DI, a sergeant's crush on her and unfinished business with her former neighbour. Oh, and great Aunt Agnes's hip and friend Ellie's romantic problems.
Can Crystal bring love and justice to Little Mallow?