Sweetheart's Lake is a romantic suspense novel set during the regency period. Alicia Bartlett's love, Edmund Pembroke, is struck down by cholera just two weeks before their wedding day. His dying wish is to see Sweetheart's Lake one last time with Alicia, where he dies in her arms. Following Edmund's death, Alicia discovers that she can see Edmund's reflection in the water, and Alicia begins to visit him at the lake whenever she feels lonely, sad, or in need of a friend. Four years later Alicia marries a dashing young physician, Dr Hilary St. John. However, one night the Royal Horse Guards burst into Alicia's bedchamber and drag Hilary off to the Tower of London. Edmund appears to Alicia in a dream and warns her that both her and her husband are in grave danger.