To the Nines by Janet Evanovich

When Stephanie Plum’s cousin and boss, Vinnie, sends her to locate a missing visa applicant who has vanished without a trace, the job seems simple enough. But as the trail stretches from Trenton to Las Vegas, Stephanie is pulled into a dangerous web of deception, obsession, and murder. Someone is watching her every move—and taunting her with cryptic messages that hint at deadly intent. With her usual mix of courage, humor, and chaos, Stephanie navigates the neon-lit world of gambling and glamour, where the stakes are higher than ever and the hunter can easily become the prey.