Nathan always looks forward to visits from Nana Cassandra. They play in the park, go to movies, and have fun with video games. But one day, something different happens — no park or movies or games, but just as special. Now that Nathan is older, he and Nana will become superheroes by performing good deeds in their neighborhood. Nana Cassandra explains that people around the world help their neighbors. Nathan learns the word for "good deed" in Hebrew, Spanish, and Arabic.

Nathan and Nana Cassandra – Superheroes illustrates diversity among cultures and ages. Readers observe the kindness of Nathan and Nana bringing groceries to an older adult, tending to animals at a shelter, and serving breakfast to individuals who are homeless. Nathan realizes that doing good deeds is a lot of work and also a lot of fun. But most important, Nathan likes the way he feels inside when he helps others.