In a city where corruption runs deep and power comes at a deadly cost, Lena Cruz is the last line of defense. A skilled operative with unmatched precision, she is tasked with protecting a prototype device that could tip the balance of power—and destroy anyone who stands in its way. As syndicate forces converge, betrayal lurks in every shadow, and the line between ally and enemy blurs, Lena must navigate high-octane chases, lethal combat, and a web of deception to survive. Fast, relentless, and cinematic, Edge of Retribution is an adrenaline-fueled thriller that will keep you on the edge of your seat until the very last bullet flies.
Nicole Castellanos is a storyteller drawn to the edge of the unknown — where science, myth, and human emotion collide. With a background in linguistics and a lifelong fascination with cryptic communication, her work explores how language and memory shape identity. The Obsidian Signal is her debut novel, blending psychological depth with cinematic tension. When she isn’t writing, Nicole can be found exploring coastlines, decoding vintage shortwave broadcasts, or sketching story ideas in storm-weathered notebooks.View all by nicole castellanos
