This presentation focuses on a recently discovered super-Li rich turnoff star in the old , metal poor globular cluster NGC 6397 ( Koch et al .
2011 , ApJL , 738 , L29 ) .
Its unusually high NLTE lithium abundance of A ( ^ { 7 } Li ) = 4.21 , the highest Li enhancement found in a Galactic GC dwarf star to date , has defied any unambiguous explanation through canonical enrichment channels .
Spectra of the star show no convincing evidence for binarity , and measured line strengths and chemical element abundance ratios are fully compatible with other turnoff stars in this GC , seemingly ruling out mass transfer from an AGB companion as origin of the high A ( Li ) .
A possible cause is an interaction with a red giant that has undergone cool bottom processing .