Another good option would be Fr. Stephen Freeman's new book "Every Where Present." Originally a blog series called "the One Storey Universe", it was mind-blowing for me and did a lot for my conversion.
It is a basic introduction to the Orthodox view of the universe and eternity, and touches on lots of things like icons, the sacraments, the saints, death, heaven, etc. It would be a good, "light" introduction without getting into heavy patristics and so forth. Most importantly, it starts from the "two storey" perspective that will be familiar to both Christians and non-Christians. It's very accessible and assumes relatively little on the reader's part.