Revenge is sweet

4 years ago graces sister robin died and now grace lives with guilt every year. Every one thinks her death was a small move wrong a mistake a tragic loss but only grace an robin know better this was no accident this was
Murder
in a fit if anger grace pushed her sister from a balcony letting her die leaving everyone to make their own assumptions that she jumped or fell. Now on the anniversary of robins death the key for her room that has been unopened since her death appears mysteriously on graces desk does she dare venture in ? And when she starts seeing robin around in her daily life what will happen ? Why is she back now ? And most importantly what does she want ?