Books like Shadow Between by Diana Stuart - undifferentiated

In a world where a newly crowned Shadow King wields mysterious powers, Alessandra schemes to become queen by wooing, marrying, and ultimately killing him—while others also plot the king’s death.

Nancy's father is accused of helping to send an innocent man to jail.

Shadows follows Leah Cornish as she faces uncertain choices while entangled with Guy Hamilton in the neon-lit streets of Phoenix.

Old Ms. McMartin is definitely dead. Now her crumbling Victorian mansion lies vacant. When eleven-year-old Olive and her dippy mathematician parents move in, she knows there's something odd about the place--not least the walls covered in strange antique paintings. But when Olive finds a pair of old spectacles in a dusty drawer, she discovers the most peculiar thing yet: She can travel inside these paintings to a world that's strangely quiet . . . and eerily like her own. Yet Elsewhere harbors dark secrets--and Morton, an undersized boy with an outsize temper. As she and Morton form an uneasy alliance, Olive finds herself ensnared in a plan darker and more dangerous than she could have imagined, confronting a power that wants to be rid of her by any means necessary. It's up to Olive to save the house from the dark shadows, before the lights go out for good.

Jill Kennedy quits the police after mistakenly profiling a serial killer and retreats to the village of Kelton Bridge to write self‑help books. A mysterious threat forces her to confront the case that cost a man his life.