When Inca and family move to London from Paris, they make a whole new set of friends, including Monk, a Blue Russian cat and Terrence, a Golden Retriever who ably and bravely assists his world-famous detective owner, Solo. Inspired by the adventures of her new friends, Inca sets herself the task of becoming the world's best cat detective and begins to keep a diary of her exploits. When Monk arrives one evening, with news of a meeting to take place later that night, Inca is excited and can't wait to attend. She is told of a perilous journey that must be undertaken by Solo and Terrence, who are to travel to the Himalayas, to search for the missing Raoul, a friend who had failed to return from an expedition. The departure of Terrence means that Inca can take on her first proper job; the baffling incident of Mr. Finchley's missing will. But does the young cat have what it takes to crack the case and save the tormented and ferocious Rottweiler - Boss? And can she do it without the help of the wily old Retriever?