Only three stones of power remain, and only the eight descendants of Zubin can wield them. Mairi, Trogen, and two of their cousins have the last four.
A ruthless and power-hungry man is intent on stealing the stones, murdering the three leaders of the fleet, and torturing the secrets of navigation from the next generation.
Grand master Astreya gives Mairi command of a ship with instructions to keep the younger members of his family far from danger.
Mairi must face political turmoil ashore, resolve conflicts with her twin brother Trogen, and lead her young crew through storms, dangerous passages, and battles at sea before she can discover the mysterious river of stones.
River of Stones begins 20 years after the end of The Astreya Trilogy. Mairi and Trogen, the twin daughter and son of Astreya and Lindey are 18, and have risen up the ranks to second mate.