Remi thinks he is the only rat who thinks differently, but is he?? Sophie is a grey rat. She isn't like all the rats in her clan. She doesn't like eating garbage and walking on four paws. She walks on two and searches kitchens for food. What will happen when she finds another rat just like her??

Jamie Flaversham has just come home from studying at Cambridge when she sees her little sister, Olivia by herself. She finds out that their father, Hiram Flaversham, has been kidnapped. They seek aid from Basil of Baker Street, the great mouse detective, and Major David Q. Dawson, who accompanies them. They find out the kidnapper works for Professor Ratigan and they have to free their father as well as stop his plan.