Tech Team and the Invisible Robot

The S.M.A.R.T.S. can''t wait for the local school''s Art of Science exhibition, which will feature pupil''s artwork made through scientific methods. It''s sure to be a great show, except for one problem - the centrepiece necklace has vanished! The S.M.A.R.T.S are baffled. There''s no sign of a break-in, and the door to the gallery was locked. Could the jewellery really just disappear? It''s up to ...