Lord John and the Brotherhood of the Blade (Lord John Grey #2) by DianaGabaldon

In her much-anticipated new novel, the New York Times bestselling author of the Outlander saga brings back one of her most compelling characters: Lord John Grey--soldier, gentleman, and no mean hand with a blade. Here Diana Gabaldon brilliantly weaves together the strands of Lord John's secret and public lives--a shattering family mystery, a love affair with potentially disastrous consequences, and a war that stretches from the Old World to the New. . . .