The Disorderly Knights (Lymond Chronicles #3)

This third volume in The Lymond Chronicles, the highly renowned series of historical novels 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 master.