Author Tess Redgrave's grandmother Evelyn Macalister, right, and Evelyn's sister, Isobel, as schoolgirls, circa 1910. "The photo haunted me," she says. "Why did my young grandmother look so sad?"Author Tess Redgrave’s grandmother Evelyn Macalister, right, and Evelyn’s sister, Isobel, as schoolgirls, circa 1910. “The photo haunted me,” she says. “Why did my young grandmother look so sad?”

Christopher Hume Macalister, Redgrave's great-grandfather, died in distressing circumstances at 33 after spending time in a mental asylum.Christopher Hume Macalister, Redgrave’s great-grandfather, died in distressing circumstances at 33 after spending time in a mental asylum.

In her memoir, Redgrave traces a history of mental illness back through multiple generations of her family.In her memoir, Redgrave traces a history of mental illness back through multiple generations of her family.

The Unfortunate Lunatic by Tess Redgrave (The Cuba Press, $38) is out now.