Hollow Cry: A Serrulata Saga Adventure - The Serrulata Saga, #1

Only the strongest survive the Ride. Aurora Verte grew up as a proper lady in the Realm-until her father betrayed the sovereign. Forced to run from her family home, she meets Leora of Mae, a peasant with extraordinary abilities; Roland Shallowbrook, a traveler on the Thieves' Road; and Leopold, a former White Rider and her half-brother. Together they become The Four and vow to overthrow the Realm's corrupt leader. During their journey beyond the Border of the Realm, they come under siege from a violent gang, who attack without warning and kidnap Aurora.
She is rescued from their clutches by a rival gang, but fears her saviors might be just as inhumane. With no way to contact the rest of The Four and realizing she is completely dependent on her new captors, Aurora must prove her worth. She soon realizes that all terrors aren't human when she is forced to make her first supply run and encounters a group of 'wretched'-monstrous, undead humans with seemingly unlimited stamina. Aurora must now not only battle for survival, but discover if she is more than the coddled lady she was raised to be. This fast-paced adventure is a companion novella to Test of the Four: Book Two of The Serrulata Saga and should be read after that book.