The Grave

Helen's twin sister died when she was 7 now 10 years have passed and Helen finds her weekly trip to the graveyard quite unsettling when not only does she see her sister's grave... but her own, dated only 5 months from present time.
Helen must avoid Death's reach with the help of her sister and her best friend.
Escaping Death isn't as easy as it may sound as there seem to be a few people trying to get in her way...
Is there a secret she doesn't know?