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We present a NuSTAR and XMM-Newton monitoring campaign in 2014/2015 of theCompton-thick Seyfert 2 galaxy, NGC 1068. During the August 2014 observation,we detect with NuSTAR a flux excess above 20 keV ($32\pm6 \%$) with respect tothe December 2012 observation and to a later observation performed in February2015. We do not detect any spectral variation below 10 keV in the XMM-Newtondata. The transient excess can be explained by a temporary decrease of thecolumn density of the obscuring material along the line of sight (from N$_{\rmH}\simeq10^{25}$ cm$^{-2}$ to N$_{\rm H}=6.7\pm1.0\times10^{24}$ cm$^{-2}$),which allows us for the first time to unveil the direct nuclear radiation ofthe buried AGN in NGC 1068 and to infer an intrinsic 2-10 keV luminosityL$_{\rm X}=7^{+7}_{-4} \times 10^{43}$ erg s$^{-1}$.

NuSTAR catches the unveiling nucleus of NGC 1068