I suppose we’re all waiting for someone.”
-- Señora Lucy ("books and roses")

Importance: In this quote, Señora Lucy is speaking to Montserrat about her keys. Señora Lucy offers the first interpretation of the meaning of keys: that they connect us to loved ones and that they remind us to wait for them. They promise us reunions.

It will be hard to let you go even for a little while, but Isidoro thought that even if worse comes to worst (which it won’t) the library key will bring you back here somehow.”
-- Aurelie ("books and roses" )

Importance: This quote comes from the letter that Aurelie, Monsterrat's mother, writes to Montserrat. To Aurelie, the key is just as Señora Lucy said. The key, Aurelie believes, will connect her to her daughter and, she even believes, bring her daughter back to her.

Apparently the house’s first owner took a particular pleasure in fastening and releasing locks—the feel...
-- Anton ("'sorry' doesn't sweeten her tea" )