LONDON (AP) — Author-activist Naomi Klein won the inaugural Women’s Prize for Nonfiction on Thursday with “Doppelganger,” a personal account of her plunge into the world of online misinformation.

Its sister award, the Women’s Prize for Fiction, went to U.S. writer V. V. Ganeshananthan for her novel “Brotherless Night,” about a family torn apart by Sri Lanka’s long civil war. Both come with 30,000 pounds ($38,000) in prize money.

Klein, author of “No Logo” and “The Shock Doctrine,” delves into her experience being mistaken for Naomi Wolf, author of “The Beauty Myth” and more recently a promulgator of anti-vaxx ideas and other conspiracy theories. Part memoir and part reportage, “Doppelganger” — subtitled “A Trip into the Mirror World” — investigates how online life has distorted reality, and asks what might be done about it.

Historian Suzannah Lipscomb, who headed a panel of judges for the nonfiction award, called Klein’s book “a courageous, humane and optimistic call-to-arms that moves us beyond black and white, beyond Right and Left.”

Ganeshananthan’s victorious second novel, which traces an aspiring medic’s journey through the brutality and moral uncertainties of war, took almost two decades to complete. Novelist Monica Ali, who chaired the fiction judging panel, said “Brotherless Night” is “a brilliant, compelling and deeply moving novel that bears witness to the intimate and epic-scale tragedies of the Sri Lankan civil war.”

The nonfiction award was launched this year to help fix the gender imbalance in the publishing world, where men buy more nonfiction than women — and write more prize-winning nonfiction books.

Prize organizers say that in 2022, only 26.5% of nonfiction books reviewed in Britain’s newspapers were by women, and male writers dominated established nonfiction writing prizes.

Both fiction and nonfiction prizes are open to female English-language writers from any country.

The fiction prize was founded in 1996, and past winners include Zadie Smith, Tayari Jones and Barbara Kingsolver, who won last year for “Demon Copperhead.”