The Disorderly Knights (The Lymond Chronicles #3)

The third volume in The Lymond Chronicles, the highly renowned series of historical novels by Dorothy Dunnett, Disorderly Knights takes place in 1551, when Francis Crawford of Lymond is dispatched to embattled Malta, to assist the Knights of Hospitallers in defending the island against the Turks. But shortly the swordsman and scholar discovers that the greatest threat to the Knights lies within their own ranks, where various factions vie secretly for mastery.