It's a short story so I'll just give some quick thoughts! 
 So far, I've loved these little short stories that give us more info about the characters in the Delirium trilogy. When I read HANA, I was left wanting a bit more from the story but reading ANNABEL kind of filled in some gaps and made the whole trilogy that much richer. Not only do we get to hear about Lena's mother Annabel before Lena was even born, but we also get a little bit more background on the new set of rules and regulations surrounding the cure and how society is changing once and for all. I thought it was great to see how similar Lena and her mother are yet they're still two very distinct characters. 
 As always, I love Lauren Oliver's writing. The beauty of it just touches me and makes me dive head first into the story. It gave me a little taste of her writing again before I'm able to pick up REQUIEM, and if you're wondering, NO I did not read the REQUIEM teaser at the end. If I start that, I'm just going to want more. I'll wait (I'm)patiently for a copy!