Books like Obsidian by Dianne Day

In a lunar colony where amber fuels electricity and psychic power, a young engineer and a charming rogue must resolve a historic family feud and a personal betrayal to preserve Harmony’s fragile prosperity.

When a young writer discovers his grandfather’s tale of a military deserter risking life in wartime Leningrad, he learns how they gathered hard‑to‑find ingredients for a wedding cake destined for a powerful colonel’s daughter.

"I very much need to be dead." These are the chilling last words left by a man who had everything to live for but took his own life. In the void that remains stands his widow, FBI agent Jane Hawk, surrounded by questions destined to go unanswered unless she does what all the grief and fury inside her demand: Find the truth, no matter what. People of talent and accomplishment, people seemingly happy and sound of mind, have recently been committing suicide in surprising numbers. A disturbing pattern is beginning to emerge. Jane is determined to give up everything to find out why. And if that means going rogue and becoming America's Most Wanted, then so be it. Those arrayed against her are legion, and devoted to protecting something profoundly important-or terrifying-enough to exterminate any and all in their way. But Jane is as clever as these enemies are cold-blooded, as relentless as they are ruthless. And she is driven by a righteous rage they can never comprehend. Because it is born of love.

Teenage girl Katy Swartz relocates to West Virginia for her senior year, adjusting to new accents, unreliable internet, and a slower pace of life before meeting a striking, tall neighbor with green eyes.