"The Last Payback" by James VanOosting (1997) is one of my treasures I found through amazon. The story is simple and simply told. It kind of unfolds in the reader's mind rather than on the pages of the book.
Twelve-year old Dale and Dimple, (DON'T call her Dorothea) are twins and since they moved to Cuthbur they have formed a secret club, the Twin Protectors. That was necessary. Being the new kids in town and twins to boot they had to stand up for one another and Dale and Dimple ALWAYS stand up for one another. So Dale's idea to always live together and be Twin Protectors and never marry isn't far from logical.
Still, Dimple hesitates. After all, she MIGHT not mind to marry Ronnie Delaney one day. And then it is at Ronnie's place that Dale is shot and dies in hospital and nobody will tell Dimple what really happened and that's where the book begins.
Dimple is tough and she is very determined to find out the truth which she thinks she already knows. It was Ronnie's fault. And hers. Because she let Ronnie kiss her one day, some time ago. But the twins had a rule: never delay a payback, and to payback Ronnie is Dimple's duty, if it is the last payback she'll ever do.
The story is told entirely through Dimple's eyes and in present tense. The reader hardly learns anything about other people's thoughts or feelings, just how Dimple perceives them, and Dimple is a down-to-the-earth kind of girl. She doesn't muse much about her brother's death, she knows what to do. But through Dimple's thoughts, feelings and memories the hidden despair of the twin-girl cries out louder from every of the 150 pages until on the very last page she finally is able to cry for her brother and can think "For the rest of my life I'll think about him". It wasn't Ronnie's fault, after all, nor was it really hers. It just happened. It is terrible, but it is real.
This is one of the best books about twinloss I read, although the word twinloss isn't mentioned once and neither is twinship at all. I just see it at work as a reader in Dimple's story. The book doesn't tell and even less explains - it shows.