Dinner with a Perfect Stranger by David Gregory -- 100 pages
Nick Cominsky is too busy to be at home much. His daughter is growing up, and his wife is at her wits end, but he can't just leave work. One day on his desk, amid the piles of paper, he receives an invitation to dine with Jesus of Nazareth. He is certain that it must be a joke, an evangelism scheme, but he is intrigued and decides to check it out.
This is a short but comprehensive little book that explains Christianity and answers many questions that are thrown at it. It is pretty easy to read or listen to.