"Solving the Unsolvable" is a gripping detective novel that follows the story of Sandip Roy, a private detective, as he takes on seemingly impossible cases that the police have given up on. The book is structured as a collection of short stories, each featuring a unique case that Sandip solves through his intelligence, intuition, and dogged determination. The cases range from thefts to murders, with each one presenting its own set of challenges and surprises.