Who would kill a woman on her deathbed? Was it an act of mercy, or murder? As Deborah and her husband, Sheriff's Deputy Dwight Bryant, investigate they cross paths with an unlikely set of suspects: Rachel's longtime minister; her neighbor, the respected local doctor; the friendly single father who often sought her advice; and perhaps the most puzzling party of all, the Designated Daughters, a support group for caregivers that Rachel's own daughter belongs to.

Soon Deborah and Dwight realize that the key to solving this case is hidden in Rachel's mysterious final words. Her mixed-up memories harbored a dark secret-a secret that someone close to them is determined to bury forever.