A writer not only develops a protagonist and antagonist, they spend a lot of time creating environment, credibility in terms of space in time, but also minor characters and their backstory,
In Nights of Indigo Blue, Daisy Muñiz’s Dad is named Octavio. It would be easy to keep the level of information simple. That’s important to the novel because we don’t want to detract too much from Daisy. But Octavio is rich with possibilities of, at some point, becoming a major player in the series. Octavio Muñiz is a Viet Nam veteran and he continued to suffer from the throes of Post Traumatic Stress Disorder until something changed in his relationship his daughter and he finally agreed to get help.
Post Traumatic Stress Disorder or PTSD is an illness that occurs for some people who have experienced one horrific traumatic event or a series. While we tend to think of major instances like wars or terrorist events, PTSD can also be suffered by persons who have lived having to cower under their beds when gunshots ring out in their neighborhoods or by witnessing the life of a mother who is in a domestic violent relationship. People have different levels of capacity for tolerating certain events so while one person may not be affected, another may need intensive therapy for healing.
All of this may seem to be on the outskirts of developing a storyline for a ‘cozy mystery’ but all characters should have depth. How much is revealed to the reader is up to the writer, to the story, and mostly, to the character!