Rising country music star Rina Sterling has captured the hearts of millions with her angelic voice and wholesome charm. But behind the sold-out concerts and screaming fans, someone is watching far too closely. The letters arriving at her door have grown darker, more possessive—and now her stalker has made one terrifying promise: if he can't have Rina, no one will. As the newest agent at Vantage Security, Roman Incardona is assigned to protect the country's fastest-rising star. The problem? Rina is stubborn, reckless, and far too good at getting under his skin. When her home is breached and the threats turn deadly, Rina proposes a desperate solution—a fake marriage to convince the stalker she's no longer available. Hidden away on a secluded island, their make-believe honeymoon begins to feel dangerously real. The chemistry between them is impossible to ignore, and the line between duty and desire quickly blurs. But while Roman works to keep Rina safe, the man obsessed with her is closer than they realize—and he's not about to let her disappear without a fight. Please note: Unstable is a clean romantic thriller with minimal swearing and mild depictions of violence. Enjoy! Don't miss the rest of the books in the Vantage Security Series!Unbroken – Aiden and MayaUnhinged – Lucas and HannahUnraveled – Carter and AudreyUnveiled – Jaxon and AdalynUnstable – Roman and IrinaUnburied – Mason and ViviUnmasked – Knox and Everleigh