Mackenzie Ziegler never believed there was anything special about herself, but her big sister knew better. When, Mackenzie was diagnosed with Stage Three Leukemia, Maddie Ziegler vows to stay by her side until the end. Maddie never realized what she had, (the best little sister) until she had a treacherous wake up call. The worst kind. And all Maddie wants is a second chance to fix everything. What can she do? Read to find out. Now, don't be fooled, this isn't a heart warming story of two sisters. This is the story of Maddie Ziegler and how she killed her baby sister.