For almost a decade Rachel Caine has turned her back on home, kept distant by family disputes and her work monitoring wolves on an Idaho reservation. But now, summoned by the eccentric Earl of Annerdale and his controversial scheme to reintroduce the grey wolf to the English countryside, she is back in the peat and wet light of the Lake District. The earl's project harks back to an ancient idyll of untamed British wilderness - though Rachel must contend with modern-day concessions to health and safety, public outrage and political gain - and the return of the grey after hundreds of years coincides with her own regeneration: impending motherhood, and reconciliation with her estranged family.