Present Day, On the Mediterranean island of Porquerolles off the French coast, landscape designer Ellie Brooke has accepted a commission to restore an abandoned garden. The fine house and surrounding estate overlook the glittering sea but the longer Ellie spends there, the more she senses darkness. WWII, Two very different women have their lives irrevocably changed: Iris, a junior intelligence officer in London, and Marthe, a blind girl who left her farmstead to work in the lavender fields who is being drawn into the heart of a Resistance cell operating in Nazi-occupied Provence. As secret messages are passed and planes land by moonlight, danger comes ever closer ...