The developers describe the content like this:

Players use weapons such as pistols, rifles, and crafted explosives as well as melee attacks with chokeholds, bats, and metal pipes to defend themselves from the infected and other human survivors. Players can also engage in stealth combat sequences involving a close-up camera view. Weapon and explosive attacks can result in decapitation and/or dismemberment. Scenes depict intense acts of violence, including themes of suicide and torture. During the game, a character makes sexual remarks about an adult magazine and a young character is shown drinking alcohol. Strong language is used frequently in dialogue.