My family of four will be traveling from Colorado to Wisconsin next week and we're looking for an audiobook that my husband and I will enjoy, and our 3-year old and 6-year old won't be any worse for the wear because of it. Anyone know of a rating system for audiobooks to tell whether or not the subject matter is appropriate for all ages, if there's foul language, etc? I've never read any David Baldacci- is his writing clean or colorful? Any ideas? We like action, suspense, mystery, autobiographies, humor, historical fiction, fiction, etc.