This book will assist the investigating officers of police department as well as of Enforcement Directorate, as to how to investigate particular crime, satisfying the ingredients of the offence charged under Bhartiya Nyaya Sanhita/PMLA, how to prove the offences on the yardstick of Bhartiya Sakshya Adhiniyam-2023 in the court of law, especially keeping in view the guidelines given by Honourable Supreme Court of India and various High courts on the key issues of investigation, so that the prosecution must be able to achieve the higher conviction rate in India, which will automatically give message to potential criminals, and India becomes a safe and disciplined country which will take us forward to become a developed nation and torch bearer to the entire world.