Legacy of Mercy by Lynn Austin

Having returned to Chicago, young socialite Anna Nicholson can't seem to focus on her upcoming marriage. The new information she's learned about her birth mother continues to pull at her, and she hires Pinkerton detectives to help her find the truth. But as she meets people who once knew her mother and hears stories about the past, Anna soon discovers that some secrets are better left hidden.

At the same time, unflattering stories about Anna are leaked by someone who would love to see her disgraced and her engagement broken. And as Anna tries to share her faith with her society friends, she understands that her choice to seek God's purpose for her life isn't as simple as she had hoped.

When things are at their darkest, Anna knows she can turn to her grandmother, Geesje de Jonge, back in Holland, Michigan. Geesje's been helping new Dutch immigrants, including a teen with a haunted past, adjust to America. She only hopes that her wisdom can help all these young people through the turmoil they face.

This book is part of the "Waves of Mercy" series.
Here are some other books from this series: