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Men with Red Teeth is a historical novel describing the rise to power of Macbeth the Red, Scotland's near-mythical king.
Markas mac Eachann, an unimportant thane in Moray, and his kinsmen are summoned to defend King Gillcoman against the bloodfeuding enemy, Macbeth. In the conflict Markas is separated from his men and his own brother becomes Macbeth's captive. With the other thanes vowing continued war and Macbeth holding his brother's life, Markas cannot hesitate. It is in this time of calamity, when bonds are broken and trust is fragile, that the fate of the country unwittingly falls into Markas' hands.