3. The Secrets We Keep (2013)
When psychotherapist and recovering alcoholic Letty Whittaker responds to a middle-of-the-night crisis call, she knows helping Trinnie face her demons won't be easy. 
However, instead of finding her friend dead drunk, Letty finds her just . . . dead. And Paul, another close friend, is the primary suspect. Worse, Trinnie's Fourth Step-AA's infamous list of resentments-implicates Paul. Letty has a choice: turn the list over to the police or use it to track the suspects back through the hard-drinking bar scene. 
In a race to prove Paul's innocence, Letty wrestles the dark addictions that nearly consumed her just months ago-and comes face-to-face with the person who's secrets were worth killing for.