LONDON (AP) — Literary biographies vie with explorations of extremism, slavery and European wolves on the shortlist for Britain’s leading nonfiction book prize.

The six finalists announced Thursday for the 50,000 pound ($67,000) Baillie Gifford Prize include “The Boundless Deep,” a biography of poet Alfred, Lord Tennyson by Richard Holmes, Frances Wilson’s “Electric Spark,” about Scottish writer Muriel Spark, and acclaimed Australian writer Helen Garner’s diaries, “How to End a Story.”

Also in the running are Jason Burke’s book about 1970s anti-capitalist militants, “The Revolutionists”; Justin Marozzi’s history of slavery in the Muslim world, “Captives and Companions”; and Adam Weymouth’s “Lone Wolf,” which traces a wolf’s 1,000-mile (1,600-kilometer) journey across the Alps in search o

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