On the surface, Melanie Kingstad-Keyes's life is the picture of success. She's a tenure track professor at a prestigious university and has a perfect husband. But a recent miscarriage has left her reeling and her marriage tenuous. Selling her family's Lake Indigo summer home, which she hasn't visited in fifteen years, feels like the perfect distraction from her problems. Now, she only needs to persuade her younger sister, Kelsey, to go along with her plan. Stuck in a dead-end job, Kelsey Kingstad bounces from one doomed relationship to the next as she struggles to jumpstart her adult life. Carrying the guilt of her mother's untimely death, Kelsey is reluctant to let go of the Victorian house filled with memories of her mom and their childhood.When the sisters find a mysterious hidden door, Melanie and Kelsey discover that they can directly view their mother's younger years and learn all the secrets she never shared with them. Delving into her memories is fun at first, but Melanie and Kelsey quickly uncover difficult truths, throwing their own life choices into question and making them wonder if they ever truly knew their mother. Visiting the past may help them find closure, but the cost could be steeper than they realize.