Grimm Orders

For Judith, Jake, Luna and Marcus decided on a summer vacation of a lifetime before they head to collage. As they were walking back to the hotel they stumble upon a book. Inside the book they find out they have a bigger job then just going to get a degree. They are now handlers of people's lives. Can death only happen because of sin, or does someone order the kills? Will they help protect man kind or will someone listen to the Grimms order?