We present the LTE abundance analysis of high resolution spectra for red giant stars in the peculiar bulge globular cluster NGC 6388 .
Spectra of seven members were taken using the UVES spectrograph at the ESO VLT2 and the multiobject FLAMES facility .
We exclude any intrinsic metallicity spread in this cluster : on average , [ Fe/H ] = -0.44 \pm 0.01 \pm 0.03 dex on the scale of the present series of papers , where the first error bar refers to individual star-to-star errors and the second is systematic , relative to the cluster .
Elements involved in H-burning at high temperatures show large spreads , exceeding the estimated errors in the analysis .
In particular , the pairs Na and O , Al and Mg are anticorrelated and Na and Al are correlated among the giants in NGC 6388 , the typical pattern observed in all galactic globular clusters studied so far .
Stars in NGC 6388 shows an excess of \alpha - process elements , similar to the one found in the twin bulge cluster NGC 6441 .
Mn is found underabundant in NGC 6388 , in agreement with the average abundance ratio shown by clusters of any metallicity .
Abundances of neutron-capture elements are homogeneously distributed within NGC 6388 ; the [ Eu/Fe ] ratio stands above the value found in field stars of similar metallicity .