The Keeper of Secrets by Maria McDonald

One lie changes a family's path for generations—and finally brings them back to Ireland, in this saga by the author of The Devil's Own.
In May 1917 the Americans sailed into Cork to join the Great War. When they left two years later, they brought their war brides with them, including Lizzie McCarthy. Still reeling from the tragic death of her sister Maggie, Lizzie leaves Ireland hoping for a better life with her new husband Ed Anderson.
Lizzie soon finds that America is not the land of opportunity she thought it was. Despite the obstacles in her path, she makes a good life for herself and her family. Ed's sisters become her closest friends and allies. At home, Ireland's bloody civil war ends. Lizzie's brother Jimmy joins her and becomes part of the family until he feels compelled to return to a new independent Ireland.
But another conflict is on the horizon, and as their family grows and plants roots in America, they take the once-unimaginable step of boarding a plane and visiting Ireland. Once there, will Lizzie finally learn the truth about her sister's death?
Praise for Maria McDonald's Tangled Webs
"An engaging, fluent and well-researched tale of an Ireland before Partition." — The Historical Novels Review