A Measure of Madness (Risky Research Book 4)

FBI Special Agent Devyn Nash has spent years chasing Coterie, a shadowy organization profiting from death and deception in the multi-billion-dollar diet and nutrition industries. When a high-profile fundraiser in Washington, D.C. exposes key members, Devyn seizes her chance to strike.

But bringing down Coterie won’t be easy. In Puerto Rico, a joint FBI operation to capture the group’s elusive mastermind erupts in a violent shootout—leaving Devyn’s partner clinging to life and Coterie’s leaders on the run. Refusing to back down, Devyn tracks their trail to Brazil, where paradise hides some of the world’s most dangerous criminals.

Defying orders, risking her career, and straining her relationship with Wyoming Sheriff Gage Harris, Devyn must decide how much she’s willing to sacrifice to bring justice to those who’ve left a trail of bodies in their wake. Because this time, failure isn’t just professional—it’s personal.

Explosive, emotional, and relentlessly suspenseful, this installment of the Risky Research series delivers danger, betrayal, and a heroine who refuses to quit.