A review by leonareads
The Caller by F.R. Jameson, F.R. Jameson

4.0

A series of bizarre, violent murders shocks London. The victims all seemingly unconnected, apart from the brutality of their deaths. Each demise is more gruesome than the last. A card, perfectly red on each side, is discovered with every corpse.
Jenna, a young crime blogger, begins to investigate. But what she finds seems beyond comprehension. A supernatural demon summoned from the pages of an old horror novel, who will kill eight people across eight nights in increasingly horrific ways. Jenna is about to discover a far more terrible truth. That if you investigate deep enough, and gain his attention, you can add yourself to his bloody list…
As he is The Caller, and when he visits, it means death!