This essay explores the powers of the International Criminal Court prosecutor to open a criminal investigation, including the legal provisions and criteria for initiating an investigation. It also examines recent cases and the need for reforms in the ICC. The essay discusses the structure of the ICC, the role of the prosecutor, and the three divisions of the Office of Prosecutor. It also covers the preliminary evaluation process and the investigation stage, including the gathering of evidence and the support required from member and non-member countries.