Wait, maybe the user is referring to a book that's not by Rebecca Brown but is translated into Spanish. Alternatively, maybe it's a mistranslation or a mishearing of the title. "Preparemosnos para la guerra" would be "Let's get ready for the war" but with the typo. Maybe it's a book titled "Get Readied for the War" but in Spanish. Alternatively, maybe the user is looking for a Spanish version of a book by Rebecca Brown but not the one they mentioned.