Trail Of Lightning by Rebecca Roanhorse

Maggie Hoskie is a member of the Dinetah tribe.  After the deluge that took much of the western United States, the tribe lives behind a huge wall that was created by the prayers of the Dinetah tribe leaders.   But all is not safe behind the wall.  Monsters are also living there and it is Maggie's decision to hunt and kill them, protecting those she loves.

Her mentor and lover was Neizghani, an immortal who is the greatest fighter ever known.  She worked and lived with him for many months, then in the midst of one of their greatest battles, he deserted her without a word.  That's what immortals do but they leave a hole behind them that is almost impossible to fill. 

After weeks of holing up in her trailer, Maggie is starting to move among her people again.  She is asked to rescue a young kidnapped girl from a monster and although she manages to kill it, she realizes that this is a new type of monster and she doesn't know who created them or for what purpose.  Her adopted grandfather introduces her to his grandson and suggests that they work together.  Kai seems to be a lightweight, turning aside situations by talking his way out of them rather than fighting as Maggie does but to please the old man she takes him along.  Can they discover who is creating the monsters that are preying on the tribe?  Can she find out what happened to her mentor and why he has deserted her?

Rebecca Roanhorse has written an entertaining tale that is unique in its setting in an Indian land after a dystopian event has changed the world we know.  Maggie is an interesting heroine and as she learns to trust and love others, the reader is taken on her journey.  The action is fast and furious and the book ends with the reader barely able to wait for the next novel in the series.  This book is recommended for readers of sci fi/fantasy.