Anthropology professor Gideon Oliver accompanies his wife Julie to the charming little Mexican village of Teotitlan del Valle in the state of Oaxaca, where Julie's expatriate relatives, the Gallaghers, operate a dude ranch resort. Up to his ears in forensic work at home, the celebrated "Skeleton Detective" can use a break and he looks forward to a week of leisure and touring. Teotitlan is an out-of-the-way weaver's village, peaceful and virtually crime- and drug-free, What could go wrong? 16th in the popular series.  (MEX259, $7.99)