The University of Maryland Medical System paid $500,000 to buy the self-published books of Baltimore's now disgraced ex-mayor, but there's no evidence any system executives ever read them or that a process was in place to determine their fair market value, an audit released Friday said.

The audit comes amid a scandal that rocked the medical system this year and after former Mayor Catherine Pugh, a former board member of the system, pleaded guilty to federal charges related to her "Healthy Holly" books. The books were purchased by the system in five installments to be donated to Baltimore City schools, as part of an educational initiative.