Hermione's secret (Narnia/Harry Potter crossover)

Chapter 3

Hermione's POV
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By the time I woke up I found myself in the Weasley's living room on the couch with a wet towel on my head. At first I didn't understand where I was and freaked out and started screaming and fighting until someone held me down. I looked up and saw ..........
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Peter's POV
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I was getting nervous we hadn't heard from Nala to tell us she made it to the Weasley's. That is until Lucy saw Harry's owl at the window and right away let her in. Around her leg was a letter addressed to me and I got scared how did Harry know where we were? I opened the letter and this is what it said in rushed hand writing
Dear Peter,
I know yours and Hermione's secret, don't ask, listen Magrim was here at the Weasley's and hermione fought back and fainted the others are worried and I can't promise how much longer I can keep ms. Weasley away. In the short amount of time I had I made her as comfortable as possible but I need your help, Ron is planning something and Nala needs you your highness, again I'll explain later but I need your help in getting her out of here please come as quickly as possible, if you need any questions you can ask them later when we have her away from here or you can ask Susan,
From Harry
PS. Don't be hard on her and hurry I don't know how long the others will wait

I freaked when I read that and hundreds of questions were in my head. How did Harry know? Why didn't Nala listen to her dad? How is Susan wrapped in all of this? And while I was thinking Lucy took the letter and showed it to my other siblings, we looked at Susan for her to explain, She began blushing and that is when everything clicked about how Harry knew, and I was mad.