The Ungodly Hour by Laury A. Egan

 

The black figure entered the viewfinder just as Dana Fox squeezed the shutter. The figure hadn’t been there a second before…
  
While leading a weeklong photography workshop on picturesque Mykonos, instructor Dana Fox is entranced by the brilliant light of the Greek island, as well as by the dark beauty, Cybele Karabélias, a local policewoman. But her idyllic sojourn takes an ominous turn when a series of gruesome murders rock the town. Heedless of the possible dangers surrounding her, Dana continues to document the isle in sunlit photographs, unaware of the killer edging closer, hungry for closure and the evidence she unknowingly possesses.