Donna Dean. Deep Six: A Novel of Life, Death, Deception and Betrayal (2001) 224 pp. [tpo]
Publishers description: This is a murder mystery and a coming of age story. Tondelayo Du Bois was raised in Marin City, California during the 1950s. After she and her adopted sister, Barbara Nadine join the Navy, Barbara is found dead in a room locked from the inside with no signs of violence. Tondelayo knows it is murder and in attempting to bring the culprits to justice, she almost becomes a victim herself.
Setting: Marin County