Any account of Robert Prevost as Pope Leo XIV has to offer something rather different from Elise Allen’s biography, which had the benefit of knowledge of his ministry in Peru and extensive interviews with the Pope himself. Christopher Lamb has taken on a more general agenda in American Hope: What Pope Leo XIV Means for the Church and the World (Headline, £25). It does not set out to be a biography; it is more of a roundup of the challenges he faces in the light of his record and personality. This is a perfectly good objective; the trouble is that, after the Allen book, interviews with assorted personalities in the Vatican and generalisations do not quite cut it.