You don't have to read it first, but you'll enjoy the references in When You Reach Me more if you have already read A Wrinkle in Time.
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REACH is a prequel to the rest of the series, Master chief was
their leader.
Read the books
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The Halo Reach Beta will include four maps. You can read about themhere.
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read a book about it
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The reach is in maine. Read Jean's memories of the funeral. She
says when they played The Reach at his memorial, she cried. Dan had
loved that area. And it was and still is home.