Doctored Evidence in Bloomington, MN

A mystery novel in the Karen Hayes series previously published in hardcover by Bridgeworks, now in paperback.
In the third book of the Karen Hayes series, an elderly nursing home resident, who was once an Olympic champion swimmer with a murky background in the German army, drowns in a lake behind the home. Does anyone know how it happened? Does anyone care? Hospital attorney Karen Hayes battles bureaucracy, listens to the geriatric residents ignored by the authorities, and risks her own life to find the truth.