This book is part of the Nancy Drew and Hardy Boys Super Mystery series. These are written at a higher level than the original two series were and this particular one features Nancy and her friend Bess who are in Mexico visiting friends of Nancy's Aunt Eloise and Frank and Joe who are also in Mexico on vacation. Nancy has promised her hosts to look into the problem of fake green cards that someone seems to be using their art school to make and distribute. Soon after they bump into the sightseeing Hardy Boys, Frank and Joe start looking into a break-in at a Mexico City art gallery where a priceless pre-Columbian artifact is stolen. While the two cases are not directly connected the teens band together to solve them.

This series was written under the Carolyn Keene name although some have been cataloguedon LT as written by Dixon. They were new in the early nineties with this one having a 1994 copyright and are set in that time. The details about Mexico were fairly generic and the 17 to 19 year-old characters were having adventures traveling and doing adult investigating which makes the stories somewhat unrealistic for adults. However, for young teens these are apparently good transition books between mysteries meant for elementary age children and mystery/adventure level books for older teens and adults. At least my son loved them.