When I Was DeathWhen I Was Death

Haunted by her sister's mysterious death, Roslyn joins a mysterious caravan of girls with whom her sister spent her last summer and who she discovers serve Death by reaping souls, forcing Roslyn to choose between finding closure or making a deadly bargain herself.
"Roslyn isn’t herself anymore. It’s been a year since her sister, Adeline, died under mysterious circumstances, and Roslyn is still tormented by her absence. So when the elusive caravan of girls that Adeline spent her last summer with rolls back into town, Roslyn joins them to finally figure out what happened to her sister. Strange, beautiful, and intriguing, the girls are closed off from the world. And as it turns out, they’re brought together by a force more sinister than Roslyn’s nightmares could’ve conjured up: Death himself. Death has spared the girls from untimely endings, and to pay for their lives, the girls travel the country reaping souls on his behalf. Now Roslyn must decide if finding closure is worth the price of striking the same deal." -- Amazon.com