Book
Beasts from the Dark
by Robert Low
Book 3 in the Brothers of the Sands series.
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In 225 CE, Drust, Kag and their companions pursue a rogue Roman officer through the Alpine province of Rhaetia. An ambush cuts off their retreat and drives them into mountain country controlled by hostile communities and men who have turned imperial confusion into private power.
Captured and manipulated by a would-be usurper, the former gladiators become pieces in a conspiracy reaching back to the court of Severus Alexander and Julia Mamaea. They must escape the mountains, identify who arranged the mission and decide how much more they are prepared to sacrifice for patrons who treat them as expendable.