Daughters of Sand

Everyone knows winning the monster-racing Shahals means status, riches, and for an indentured servant like Sabine, freedom—except only men can compete. As her only means to a better life, Sabine must disguise herself as Rider Nyx and take her chances in the races.
As an empath, Princess Ianthe is an abomination to her people. She’s desperate to find her mother’s tribe and learn to control the magic that could send her to an early grave. Instead, her father orders her to wed the winner of the Grand Shahala, the final monster race.
Two women with no choices, and only one way out - forming an unlikely alliance to beat the races together, share the proceeds, and earn the freedom they both desire. Now Sabine is caught up in a web of lies and increasingly dangerous races—made all the more difficult by her growing attraction to the sheltered princess.

Winning means freedom.
Failure means a life in chains.
And the most dangerous race is still ahead ...