  Several different experiments have hinted to the existence of "anomalies" in
the neutrino sector, implying the possible presence of additional sterile
neutrinos or of other options. A definitive experimental search, capable to
clarify either in favour or against all these anomalies at the appropriate > 5
sigma level has been proposed by the ICARUS-NESSIE Collaboration. The technique
is based on two innovative concepts, namely (1) a large mass Liquid Argon Time
Projection Chamber (LAr-TPC) now in full operation at LNGS and (2) the search
for spectral differences in two identical detectors at different distances
along the (anti-)neutrino line(s).
