The answer to that is 3 words...I don't know.
But here is why I chose the titles I did for my 3 one word titles.
Tethered - to be attached to another object
In the Tethered (book 1 of J+P series) novel, Perry is finding her way at college. But she comes from a home where emotional and verbal abuse are the norm. Her parents are enmeshed in her life and control her like a marionette. She is Tethered to her parents, no matter how many miles separate them.
Inconsequential - of little or no importance; insignificant; trivial.
Inconsequential (book 2 of J+P series) follows Perry as she inches closer to freedom and becoming untethered. But she soon learns that what she wants or needs is Inconsequential to her parents.
Rarity -something esteemed or interesting in being rare, uncommon, or curious
Rarity (a stand alone novel) deals with a teen diagnosed with a rare collagen disorder that makes their bodies very fragile and can be fatal. Other examples of Rarity in the book include the male character being charismatic and crossing all clique boundaries and also the courage to love unconditionally and take the good and bad days. As a teen it is easy to care just about yourself and how others perceive you. It is also a risk to embrace the unknown, which Brogen is faced with.