Tsarina by Ellen Alpsten 

St. Petersburg, 1725. Peter the Great lies dying in his magnificent Winter Palace. The weakness and treachery of his only son has driven his father to an appalling act of cruelty and left the empire without an heir. Russia risks falling into chaos. Into the void steps the woman who has been by his side for decades: his second wife, Catherine Alexeyevna, as ambitious, ruthless and passionate as Peter himself.

Born into devastating poverty, Catherine used her extraordinary beauty and shrewd intelligence to ingratiate herself with Peter’s powerful generals, finally seducing the Tsar himself. But even amongst the splendor and opulence of her new life—the lavish feasts, glittering jewels, and candle-lit hours in Peter’s bedchamber—she knows the peril of her position…. Read more.