It's about a serial killer. Entire series is full of severe stabbings and a great deal of blood.

The murder scenes while not explicit are very realistic and for some will be upsetting. The fake blood people made a killing on this one. (pun? What pun?)

Although not necessarily classified as "gory", there are some very intense murder scenes in this series that will make some people wince, as well as scenes that will likely be emotionally disturbing. Some of the murders are pretty brutal.