Detroit Math Detectives, First Casebook

At the Major Crimes Unit of the Detroit Police Department, Detective Lopez and Detective Washington often call on Prof. Charles S. Grantham from Oakland University to help them out on their cases with his mathematical expertise.
The strange cases include the robbery of a garbage truck, a serial killer who demands the life stories of his victims, a paycheck theft led astray by a failure to observe the proper arithmetic operator precedence, an unexpected pistol expert, a cult that kidnaps people from escape rooms, etc.
The stories may be read in order or you may skip around, much as I have through the Sherlock Holmes stories. Though there are little references to a case that is not solved until very close to the end.
High school algebra should be enough to understand the mathematical concepts presented. Not recommended for children on account of occasional violence.