This article is associated with Into the Gauntlet.
Margaret Peterson Haddix is one of the authors in writing the 39 Clues series.
Margaret Peterson Haddix has put her Ekaterina intelligence and curiosity to good use, first as a journalist, then as a bestselling novelist of The Missing and other mega-popular series. After the terrible discoveries, she made researching Into the Gauntlet, Haddix went into hiding. Agents on the ground suspect she is living in a bolt hole near Columbus, Ohio.
39 Clues Books