A Broken Land - David Donachie

1936: When a favor to a friend leaves Cal Jardine caught up in the Spanish Civil War, he finds himself with an interesting assortment of fighters. His new compatriots are a group of athletes in Barcelona for the People's Olympiad. Together, they make an effective team and are primed for the fight; however, with a communist fanatic in the ranks, trouble is brewing. Even worse, a murderous betrayal lies ahead which threatens not just the fight, but Jardine himself. From the street battles of Barcelona to the fighting in the countryside, Jardine finds action as well as friendship—but will he have suitable revenge on his betrayer?