Since I just reread Delirium, and am now starting Pandemonium immediately after typing this pseudo-review, I was excited to find Hana, listed as Delirium 1.5. I don't have a lot of experience with these "in between" type novellas, but I was already in the Lauren-Oliver-dystopian mood, so I figured there was no harm in giving it a chance. 
 First off, this is insanely short. I mean, I get that it's a novella, but I didn't expect for it to be THIS short. I'm not sure it was worth the measly $2.99 I paid on Amazon, honestly. And, except for the last line -- the WTF cliffhanger, I didn't feel like anything really added to the story. We see the party raid from Hana's perspective, we learn that she had a secret lover of her own (who disappears), and we watch as she discovers that her straight-as-an-arrow buddy Lena isn't as straightforward as Hana previously thought. 
 If you read this, just read it for the last line. Save your $2.99 and scroll down several lines if you want the spoiler. 
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 If you don't want a spoiler, stop now. 
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 Ok, here we go. You were warned. 
 "Reward for information. If you see something, say something. ..... If you know something, do something." 
 And then that killer last line... 
 "I'M SORRY, LENA" 
 WTF, HANA?!?!