Set in England in 1929, Maisie becomes enmeshed in a mystery surrounding The Retreat, a reclusive community of wounded WWI veterans. At first, Maisie only suspects foul play, but she must act quickly when Lady Rowan's son decides to sign away his fortune and take refuge there. Maisie hurriedly investigates, uncovering a disturbing mystery, which, in an astonishing denouement, gives Maisie the courage to confront a ghost that has haunted her for years....