Crimson Poison — Susan Moore

Nat Walker is the orphan heiress to her parents' games empire. While the mystery behind their deaths remains unsolved, Nat must fend off the unwelcome and avaricious attentions of her aunt, who is keen to “adopt” her and her millions. When her guardian, Jamuka, is called back to Mongolia by a clan emergency, Nat discovers vital information about the poison that is killing his people. She decides to follow him, and in doing so, becomes drawn into the deadly game of revenge, corruption and world domination that is playing out against the snowy white Steppes.