An aging authoritarian ruler, a violent police state and a restless, polarized people seething with paranoia: It’s a dangerous time for poets. Two of them — the great Kit Marlowe and the up-and-comer William Shakespeare — meet in the back room of a pub to collaborate on a history play cycle, navigate the perils of art under a totalitarian regime and flirt like young men with everything to lose. One of them may well be the death of the other.