The Concrete Bloodline

A Sapphic Spy Thriller Romance

By: Christopher Penn, Claude Opus

Narrated by: Virtual Voice

When a cynical nanotechnology genius and a defiant historian collide at a Washington D.C. gala, they're thrown into a deadly conspiracy that spans from ancient Rome to modern-day Istanbul.

Dr. Aris Thorne doesn't do trust. After a catastrophic failure cost her colleagues their lives, the brilliant scientist has built walls higher than the Brutalist buildings she works in. Cold, controlled, and lethally competent, she views human connection as nothing more than a structural weakness waiting to fail.

Casey Rhodes doesn't do passive. A historian who sees the layers beneath every surface, she's spent her life observing stories rather than living them. But when a brush pass gone wrong leaves her holding a deadly secret, she refuses to be anyone's collateral damage.

The secret? An ancient Roman nanotechnology capable of turning human flesh to stone—and a shadowy society called the Fraternitas Lapidis will kill anyone who stands between them and their weapon.

Forced together across three continents, Aris and Casey must infiltrate the Vatican Archives, escape through the Catacombs of Priscilla, and face a final showdown in Istanbul's haunting Basilica Cistern. But the greatest danger isn't the assassins on their trail—it's the walls around their hearts beginning to crumble.

Because Aris is learning that some structures grow stronger under pressure. And Casey is discovering she was never meant to just preserve history—she was meant to make it.

The Concrete Bloodline is a white-knuckle sapphic romance featuring:

• Grumpy/Sunshine dynamics that will melt your heart
• Forced proximity with only one bed (you're welcome)
• An alpha female who's terrifying to enemies and devastatingly tender to her person
• Competence porn in BOTH directions
• Ancient conspiracies meets cutting-edge science
• International settings: Washington D.C., Rome, and Istanbul
• A slow-burn that ignites into an inferno

For readers who love their romance with a side of espionage, their thrillers with a beating heart, and their heroines unapologetically brilliant.

Heat Level: Sensual/Mature (4 out of 5 flames). Contains explicit romantic scenes, spy thriller violence, and body horror elements (petrification).