Vanity: Murder in the Name of Sin, by Rhiannon Garrard

Mitokoa, an idyllic, proud little town. Beautiful. Picturesque. Nothing special about it…until a gruesome murder happens in broad daylight in a busy cafe. When Detective Katelyn Rush is sent in to oversee the investigation, she knows nothing about Mitokoa—only its reputation. When she arrives, she soon finds more out of place than a murder. Something else has hit this town, something more horrendous than a killer. Worse still, it doesn’t seem to have left. From the second she arrives, time is ticking—to uncover the murderer, the source of the madness, and the connection between them—before she is swallowed up in the insanity as Mitokoa’s next victim.