A landscape architect unearths the tangled history of a once-celebrated English garden—and all its mysteries—in a captivating novel by the author of The Last Secret of Lily Adams. Julia Esdaile is hired to restore the historic gardens at Havenworth Manor—the grounds of which are now an abandoned snarl of bramble and weeds—to their original splendor. For the enigmatic lady of the manor, ninety-two-year-old Margaret Clarke, the reason for the restoration is the deeply private story of a promise made a lifetime ago, and a vow to keep it before she dies. It’s 1940, and Margaret’s older half sister, Irene, an aspiring artist, dreams of an exciting world beyond Havenworth. Her only escapes are James Atherton, a handsome officer in the RAF, and her sketchbook of flower drawings. Bonding over their disdain for war, Irene follows James to London, where, irrevocably in love, she is forced to make a choice she never imagined. With that, Irene vanishes from Margaret’s life forever. Now, with the help of Margaret’s godson, Andrew, Julia is determined to uncover both the long-buried secrets of the past and the truth behind a heartbreaking mystery that only restoring the gardens of Havenworth can solve.