The protagonists in the trilogy are the eponymous Midnighters Desdemona (referred to as Dess), Rex, Jonathan, and Melissa.
The antagonists of the series are Darklings and Slithers, dangerous and powerful beings that created and live in the Blue Hour.
However, approximately 50 years before the beginning of the book The Lore ceased to be updated for unknown reasons.
The disappearance of the previous generation of Midnighters remains a mystery until the second book, Touching Darkness.
Despite all possessing the ability to pass into the Blue Time, they do not always work together, which resultsfrom personal conflicts between members.
At the conclusion of the novel, it is revealed that Jessica is a "flame bringer," a rare talent that allows her to create fire and use electrical devices during the Blue Time.
This makes her a valuable addition to the team, as she can use this ability to be a formidable opponent against the Darklings, who fear light, fire, and technology.
At the climax of Blue Noon, Jessica uses her ability to harness the power of a lightning bolt to fight the Darklings.
In the books, it is even suggested that ability is so extensive that she can process mathematical data at a greater rate than even a regular computer Throughout the series, she uses that ability to deduce the "shape" of the Blue Time, which allows her to predict abnormalities in the fabric of time and space within midnight.
Dess has an extreme dislike for Mindcaster, Melissa, whom she thinks to be manipulative, nasty, and bordering insanity.
Rex loses his need for glasses at the end of Touching Darkness after the Darklings turn him into one of them, which makes him able to go without them during Blue Noon.
During the Blue Time, Jonathan's personal gravity is reduced, increasing his jumping distance dramatically.
By making physical contact, Jonathan can share the effects of reduced gravity with both people and objects.
Unlike the powers of Dess, Rex, and Melissa, Jonathan's acrobatic skills function only during the Blue Time.
That nakes his movement back into real time more physically intense, as he must readjust to regular gravity.
Before the events of The Secret Hour, Jonathan rarely associates with any of the other Midnighters because of a personality conflict with Rex.
There are a number of factors that can influence Melissa's mindcasting abilities, such as proximity to the subject, physical contact, and wrinkles inherent within space and time.
Melissa then begins to let Rex touch her which allows him to enter her mind and relieve the strenuous pressure caused by the thoughts of others.
It is revealed in the last chapter of Blue Noon that Melissa chooses to leave Rex in Bixby while she and Jonathan go to find the new midnighters of the world.
Melissa has the ability to enter someone's psyche and force them to go insane to the point that they cannot take care of themselves and are left completely incompetent.