It chronicles Yuyi Morales' journey from Mexico to the United States with her young son, Kelly.

She describes the difficult transition period in which she was surrounded by an unfamiliar language and has trouble assimilating, which she referred to as making "mistakes.

But I was unsure that I could come up with the right words, in a story for children, to counteract the prejudice, discrimination, and hate exuding in the country.

She clarifies that that bridge connected Ciudad Juarez, Mexico, to El Paso, Texas, and they crossed when Kelly was two months old.

Her mother-in-law introduced Morales and Kelly to the library where she relied on illustrations to convey they meaning of books.

Beautiful and powerful at any time but given particular urgency as the status of our own Dreamers becomes uncertain, this is a story that is both topical and timeless".