Talvez Blood Red Road por Moira Young?
Saba lives with her father (her mother is dead), brother Lugh, and
younger sister Emmi in a wasteland where laws do not exist. Half a
year after Saba and Lugh turned eighteen, four cloaked horsemen show
up, kill the father, and kidnap Lugh. The novel revolves around Saba's
quest to find and rescue her brother, with whom she has a close
relationship.
Saba does not like her younger sister Emmi as she blames Emmi for
their mother's death (who died giving birth to Emmi) and tries to
leave her with a family friend named Mercy, but Emmi follows Saba. The
two are captured by a couple who force Saba to fight in the Colosseum
for a man known as the Cage Master. The couple, Mr. and Mrs. Pinch,
keep Saba fighting by abusing and threatening the life of Emmi. Saba
and her sister eventually escape from Hopetown, the place where the
Colosseum is located, with a fellow fighter named Jack and a group of
female warriors known as the Free Hawks.
As the story progresses, Saba learns that Mr. and Mrs. Pinch are
actually the parents of a king who uses an addictive drug to control
people. This same king is the one who sent the four cloaked horsemen,
known as the Tonton, to kidnap Lugh. Not only are more plans made to
rescue Lugh, but more conflict ensues and a romance develops between
Saba and Jack.