Don't Ever Get Old (Buck Schatz Series);

When Buck Schatz, senior citizen and retired Memphis cop, learns that an old adversary may have escaped Germany with a fortune in stolen gold, Buck decides to hunt down the fugitive and claim the loot. But a lot of people want a piece of the stolen treasure, and Buck's investigation quickly attracts unfriendly attention from a very motley (and murderous) crew in Daniel Friedman's Don't Ever Get Old, nominated for an Edgar Award for Best First Novel.