This concise French-language work examines the role of insects in police investigations, focusing on how insect evidence can support criminal inquiry. Published as a short professional monograph, it presents forensic entomology as a practical aid for investigators, especially in matters involving time, place, and conditions surrounding a death or crime scene. The book is intended as a specialized reference rather than a narrative true-crime account, offering readers a focused introduction to the ways insects can become meaningful evidence in law-enforcement contexts.