HBO’s new limited series “The Third Day” boasts an original structure to tell a relatively familiar story. Six episodes will air on HBO broken up into two halves of three episodes a piece. Each half has a different protagonist and takes place months apart. And the two halves are connected by a live episode next month which will reportedly consist of a single unbroken shot and isn’t really needed to make sense of the story as a whole. Got that? It’s a lot of structure to keep track of for a relatively short mini-series.