Butterfly Heart, by Moa Backe Astot

Vilda, a half-Swedish half-Sami teen, has been grown curious about her ethnicity.  Her mother doesn't know Sami and Vilda never got to attend a Sami-speaking school, so Vilda's never learned how the language.  Her grandfather though has been teaching her a few words and she's hungry to learn more.  She also wants to get a gabdde (a traditional ethnic outfit) so she can wear it at festivals and show off her heritage.  But then her grandfather suddenly dies.

Wracked by grief and a realization that learning how to be Sami has just grown all the more harder, she stumbles through the summer trying to piece her plans back together again.  There's a cute older boy who speaks Sami, who she pins her hopes on, but he rejects her as being a child.  She unsuccessfully tries to explain her feelings about not knowing her heritage and losing her grandfather to her bewildered friends.  To top it all of, she's just gotten her first period.

A spare story of grief and search for identity through the eyes of a thirteen year-old.  American audiences won't know much about the Sami -- an indigenous people who live in northern Scandinavia -- but the search for one's heritage and where one fits in should be meaningful to anyone.  Vilda can be pretty mean at times and definitely selfish (and her use of language will trigger some parental readers) but her coarse edges and big feelings struck a realistic note.