The series follows a girl named Robin who just wants life to be normal, but what's normal when you're only half human, your best friend is dead, and you can suddenly control the power of angels?

The series is New Adult, Modern Fantasy with a sub genre of Romance. I like to call it my love child crossover of Harry Potter x Sailor Moon. There is energy manipulation, magical realism, dimensional references, lots of angels, and lots of celestial themes. (It has very mild language and references to death, but I would not consider them graphic.)
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Here's the blurb from book one:

"She stands accused of murdering angels. He'll do anything to make sure it stays that way."

Robin Marie Luxley is bad luck. But she doesn't want to be. She just wants to go through her teenage years like a normal girl: go to school, listen to music, and maybe find true love. Instead, she spends her time watching everyone around her die—as if death seems interested in her in particular. And she's gotten used to the dark. Bad things happen.

But when her aunt dies, things change. A stranger wearing black appears in the hospital room to warn her: she's not at all who she thought she was. And maybe she really isn't bad luck. Maybe someone is targeting her family instead.

Secrets unravel, and Robin must unlearn everything she thought she knew about being human in order to track down whoever has been killing her family, or she's next.