Moon Shadow by J.R. Rain — book slip

Samantha Moon, once a federal agent and now a vampire, juggles her life as a private investigator with the supernatural challenges that come her way. In "Moon Shadow," she is hired to investigate a lake monster terrorizing Lake Elsinore, threatening the local tourism industry. As she delves deeper, she uncovers a connection to two missing boys, leading her and her werewolf boyfriend, Kingsley, into a web of paranormal intrigue. With time running out, Samantha must navigate the dangers lurking beneath the lake's surface and protect those she loves from an ancient evil.

Part of the ongoing 'Vampire for Hire' series, this installment blends mystery with supernatural elements.