The fascinating characters that roam across the pages of Emma Donoghue's latest fact-inspired fictions have all gone astray: they are emigrants, runaways, drifters. They cross other borders, too: those of race, law, sex and sanity. They travel for love or money, incognito or under duress. Donoghue describes the brutal plot hatched by a slave in conjunction with his master's wife to set them both free; she draws out the difficulties of gold mining in the Yukon, even in the supposedly plentiful early days, and she takes us to an early Puritan community in Massachusetts unsettled by an invented sex scandal.