The Deepest Sigh — Naomi Musch

Seventeen year old Marilla Eckert is in love with Langdon "Lang" Prescott, her family's hired farm hand, unaware of his passionate feelings toward her older sister Delia. When Delia weds a longtime beau, Lang settles for Marilla instead, despite his continued longing and intent to someday win Delia away from her husband. Marilla soon realizes where Lang's devotion truly lies, yet she presses on, bearing his children, convinced she can still gain his love.

Then America steps into the Great War. The men are sent a world away to fight, and Marilla's cares, coupled with the lack of her husband's favor, finally wear her thin. When heartache and disaster strikes on every front, and Marilla's hour of need leads her elsewhere for comfort, will each of them wind up too broken to ever find their hearts' true homes?