A dark assassin romance that asks the "What if a character like Captain America had a sexually deviant & morally grey side?" From the NYT bestselling author of Grave Matter and Blood Orange. Her kiss may be deadly, but he’s indestructible. Erasmia "Mia" Baxter is her agency's most lethal operative, genetically engineered to have poisonous saliva. But having the kiss of death is hell on her social life. Her future holds no romance, no family, no intimacy of any kind—only killing for her country. When her special ops group hears rumors that America’s first superhero—Vanguard—may be more deadly weapon than golden boy hero, Mia is tasked with infiltrating Vanguard’s inner circle to investigate. What she finds is a former super soldier who has a hidden dark side—and can kiss her without consequence. Intoxicated by the obsessive passion rising between them, Mia falls deeper into lust with each new sensual encounter. But the closer they become, the more she realizes there might be truth to the rumors. Vanguard is changing—becoming more violent, more devious, less…human. And the truth of her identity might push him over the edge entirely. In a world where heroes and monsters are separated by the thinnest of lines, Mia must Is the man she’s falling for worth saving? Or is he a monster that must be destroyed—before he destroys her first? A dark romance special ops spy thriller with a post-dystopian sci-fi bent—VANGUARD has the gripping twists and turns of BLACK DOVES paired with the seductive intensity of Runyx’s DARK VERSE and ST. Abby's MINDF*CK series.