I only needed one alghoul which I got in the cemetary.
You can only attack when the location is dangerous. You have to actively draw your sword to attack, not mouse click attack.
Now I'm stuck trying to find plants to kill after killing several without the entry in my log.
I think the price of books is way too high. I hardly find any 'free' information ransacking people's homes, etc. I have to buy the book at 500 orens to complete the quest that gives me like max 200 orens.
I feel like LOTRO server prices are in effect in Witcher.