Greenmantle by John Buchan

1916. Richard Hannay is recuperating from injuries sustained at Loos.¬†Hannay, you recall, is the doughty hero of The Thirty-Nine Steps. Sadly,¬†Greenmantle does not have the simple narrative line of that fine chase novel. Instead, Hannay is sent on a mission to Turkey to try to stop Germany’s secret weapon, which is a….well, it’s a sort…