An unexpected night

There are six friends Selena, Elena,Hailey,David, Sam and Rick who decide to go for a weekend picnic, near a lake But, things change for the worse, do you think they will be able to come through situations of horror and murder? And find out who is behind this? ---------**--*----- Please read it to find it out, your guesses will be welcomed as comments, and as I am in the writing process, you can also give me an open advice if you want some changes in the story, or what you would like next.