Rachel Jackson's idyllic life takes a dramatic turn when she discovers a woman's scarf in her politician husband's computer bag. But in an election year, seeking answers to questions of infidelity is not an option. When her mother gives her a family heirloom, a travel trunk owned by an ancestor, she finds a distraction. As she immerses herself in its contents, she discovers a woman whose life is vastly different from her own. Or is it? Determined to dispel the notion that her ancestor Marit was insane, Rachel sets out to unveil her unknown story. In the interwoven narratives of these two women, who are bound by blood and a shared struggle, The Blue Trunk is a poignant exploration of identity, love, and unwavering strength.