Garth Hellyer is working for the Longevity Project, interviewing the oldest living people on the planet. But nothing has prepared him for Marged Brice, who claims to be a stunningly youthful 134. Marged says she wants to die, but can't, held back by the presence of someone she calls Perdita. Garth, despite his skepticism, is intrigued by Marged's story, and agrees to read her journals of life in the late 1890s. Soon he's enthralled by Marged's story of love, loss, and myth in the tempestuous wilderness of the Bruce Peninsula.