What's the Name of That Book??? discussion

Hello

I'm looking for a book that I read quite long ago when I was in elementary school- around 2011.

What I remember about the plot is that it was about the pied piper of Hamelin. He lures a group of children from their homes and leads them into a cave which opens up to a forest on the other side, I think. One of the children is a boy who is lame or broke his leg. Not sure which but he was slower than the rest and eventually got left behind near the cave. The main character is his sister (or friends... Not sure) and she follows the piper to the other side. I can't remember what happens after that but I think the children become cursed and turn into animals at night or something. Only the main character does not turn. The piper also turned into an animal and I think he turned into a wolf.

..... Maybe I'm just mistaking two different books as one but I have been searching all over and I still haven't found it T T. Please help me if you have any idea which book has this kind of plot. ><

Wild Magic by Cat Weatherill? From School Library Journal:

"Gr 4 –6— Weatherill uses events and characters from Robert Browning's "The Pied Piper of Hamelin" in this novel that begins with the mesmerizing Piper leading the town's children away. They follow him through a magical door that opens to a place inside Hamelin Hill. Right away, their excited giddiness turns to panic and fear. They're trapped. "When the door closed, summer had been left behind. In here it was winter." For the first 50 or so pages, the main character is a girl named Marianna, whose disabled brother, Jakob, can't keep up with the others and becomes, at least briefly, the only Hamelin child not trapped inside the Hill. Then, the story shifts to tell the backstory of the Piper . Readers learn that he is half human, half elf, and has been cursed to turn into a beast whenever the moon is full. His salvation can only come from a child with special powers in a town overrun by rats. Classic fantasy themes like loyalty, transformation, and sacrifice are part of this interesting book. Especially intriguing are the scenes of Marianna changing into a fox and experiencing the world as a wild animal. But the plot suffers from multiple points of view—from Marianna to the Piper , and then on to Jakob and even Marianna and Jakob's father—that aren't done in an integrated way, giving an overall disjointed feel. Buy if you have an avid fantasy following and/or a large collection.—Lauralyn Persson, Wilmette Public Library, IL --Lauralyn Persson (Reviewed November 1, 2008) (School Library Journal, vol 54, issue 11, p138)"

Angela wrote: " Wild Magic by Cat Weatherill? From School Library Journal:

"Gr 4 –6— Weatherill uses events and characters from Robert Browning's "The..."

OMG Yass. I think it's that one. I'm glad I got to find it so quickly. ^^
I'll read it first and confirm later though lol

Just in case someone is looking for an even older version, Gloria Skurzynski wrote What Happened in Hamelin, also based on The Pied Piper legend.

Moving from Possibly Solved to Solved.