These are the two novellas in the Covenant series by Jennifer L. Armentrout, which I reviewed earlier this year. I don't remember if I read them at that time or not, but I re-read them to put on here because I think they are worth reading.
The first book, Diamon, takes place in the weeks before Alex is found and taken back to the Covenant. We get a peek at what her life was like living as a normal human. We also get to see her mom before she was turned, as well as those first attacks.
I really enjoyed reading this novella. Since I don't remember if I had read this one prior and since most prequel novellas are either too short or take place so far ahead of the story that they have little to do with the characters in the main story, I was slightly skeptical about this book. But it was just as interesting and compelling to read as the rest of the series.
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The second novella takes place between the third and fourth book and gives us a perspective of Alex when she was on the Elixir. This novella is told from Aiden's POV. We know from reading the fourth book that Alex was kind of a psychopath, and in this novella we get to see Aiden's struggle with the choice he had to make of putting her on the Elixir, as well as how he came to the decision to take her off it.
This was a really great novella, and it did give some missing time between the two full books. I really enjoyed reading things from his perspective. And we really get to see the depth of his love for Alex.
All-in-all, these novellas are worth picking up along with the rest of the series. JLA is really becoming one of my favorite authors.