Pretty Little Liars 

Pretty little liars is my favourite English serial. It is about five girls who are friends. But one day one of them died and others of them were every frightened when they found that their friend somebody killed. And now somebody monitors their. He has a nickname - A. He sends them very scary SMS and links.He threatens them but they are very strong and they fight with him. Maybe it looks very scary but it isn't.  It is very gripping serial and and I can not wait next series.Now is the third series. I saw the serial about 10 times already and still I like it .And I suggest you check it.   
http://beta.abcfamily.go.com/shows/pretty-little-liars