The 4th book in the Atlee Pine series.
Atlee is a badass FBI agent obsessed with finding her twin sister, Mercy, who was abducted at the age of six and never seen again.
… Mercy left at least one dead body behind before fleeing her captors years before.
Atlee has no idea if her sister is still alive, and if so, how she has been surviving all this time. When the truth is finally revealed …Amazon
This ain’t literature. But it kept me going.
I appreciated Mercy turning out to be an uneducated 6 foot tall MMA fighter.