Their family cross-country drive in an RV - stopping in little-known towns with little-known claims to fame - provides the basis for random facts of all sorts.
An entertaining read. As far I could tell, a couple of the books had extra ciphers directed at the reader, and I thought those were especially fun.
- Mission Impossible (#1) ★★★½
- Never Say Genius (#2) ★★★
- You Only Die Twice (#3) ★★★
- From Texas with Love (#4) ★★½
- License to Thrill (#5) ★★½