The Book of Evil by Scott Snyder

Imagine that from tomorrow morning onward, nearly every baby born into this world is a future psychopath.

There is no answer as to why the change is happening. Is this human evolution? Devolution? An uncurable virus of some kind? Regardless, just like that, the new normal is psychopathy.

Fifty years in the future, four friends must set off on a journey that will take them down the roads and rivers of this transformed America in hope of finding a place where goodness still lives.