Gertrude Chandler Warner’s novel about four orphaned siblings who run away and take up residence in an abandoned boxcar in the woods was first published in 1942, launching a series that would remain popular with young readers for decades and become a staple in library, classroom, and home collections. The “Boxcar Children Mysteries” oeuvre (Albert Whitman) now encompasses 130 titles, and the concept has been expanded into other formats, including an easy reader series and graphic novels. To mark the 70th anniversary, Albert Whitman is re-launching the series with a fresh new book design and is also publishing a prequel written by Newbery-Medalist Patricia MacLachlan.