This is part 1 of the two-part crossover with NCIS: New Orleans but it looks like Ten will treat it as a standalone episode, which is disappointing. Ten should show part 2 the following Sunday (April 24) or even better, on the same night right after NCIS, just like the US.
EDIT: Ten will indeed show part 2 on Sunday April 24 at 10.30pm, so NCIS: New Orleans will air out of order for the rest of the season.