Unstable

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? R...