Warning: Though it is not the intention of this user, content descriptions may contain unavoidable spoilers

List of instances:

A car crash and explosion is seen. A dead body is shown being pulled out of a body of water onto a boat. There are dialog references to a man being shot dead and another eaten by cannibals. An aftermath of a body being burnt in a furnace is shown and a pile of ash is seen. A character is attacked in his sleep and nearly strangled. A body is blown up with dynamite though the act is only heard and not seen. Characters are nearly killed via a falling boulder pushed off a cliff by an unseen assailant. Aftermaths of characters whove been beaten over the head for the purpose of incapacitation. A dialog reference to a corpse being dismembered by having his head and limbs amputated. There is another dialog reference to a character being shot. A character is shot in the hand.

Overview:

No graphic violence is seen and most of the murders are referenced to in dialogue or briefly viewed from afar (if at all) in aftermath scenes.

Characters are frequently seen drinking socially and smoking tobacco. A character is seen drinking alcohol from shot glasses and has slurred dialog indicating that he is drunk. Strong tobacco is used by a character as a stimulant to keep awake and alert for a long vigil ahead A character is seen drinking more and more, presumably to calm his nerves.

No illicit drug use is seen or referenced to though there is frequent use of alcohol and tobacco including a couple scenes of alcohol abuse.

The tone and setting of this murder mystery is grim, dark and melancholy. Both protagonists and supporting characters are in frequent-constant peril.