A good portion of my career has been spent working with businesses to help identify financial fraud. My area of expertise was usually around technology and automated financial systems.
Your General Ledger (GL) is a good place to start looking if you suspect fraud. The GL is, in a way, a mystery story.
In the case of fraud, the GL is awaiting you to reveal the perpetrator. It can tell stories of fraud, manipulation and betrayal. Unfortunately, few people know how to read the signs.