Segura, a former South Florida journalist, knows the region well, and he imbues “Blackout” with an insider’s view, as well as familiar scenes such as Vizcaya, the Biltmore Hotel, LeJeune Road and the restaurant Islas Canarias. Although “Blackout” occasionally goes over the top with its action, Segura keeps it believable. It is, after all, Miami. Segura is just what South Florida crime fiction needed.