The green dress

"When Harriet Peters came to Boston in 1882, the Robinson family took her in like one of their own, and Harriet became closer to Lizzie Robinson than her own siblings. Now, four years later, Lizzie is deathly sick, failing quickly just like several others in her family have done over the past few years. How can so many in one family die from the same mysterious illness? Harriet doesn't have answers, but she is determined to help the family, bring...