In plain English
Horatio reads Hamlet's letter: 'Horatio, after you've read this, help these sailors get to the King—they have letters for him. Two days out at sea, a well-armed pirate ship chased us. We were too slow, so we fought back out of necessity; I boarded them, and they cut away, leaving me their prisoner. They treated me with surprising mercy, but they knew what they were doing—I owe them a favor. Get the King his letters, then come to me as fast as if you were fleeing death. I have things to tell you that will leave you speechless, and even my words can barely capture the weight of it. These men will take you to me. Rosencrantz and Guildenstern are still heading for England—I have much to tell you about them. Goodbye. Yours, Hamlet.' Horatio then tells the sailors he'll help them deliver the letters so they can lead him to Hamlet.
What’s happening
Horatio is reading aloud a letter from Hamlet that has arrived unexpectedly via sailors. Hamlet has escaped Claudius's death plot in England and been captured by pirates, who are apparently cooperating with him. The letter is urgent and conspiratorial—Hamlet needs Horatio to come to him immediately because he has shocking news. This scene is a narrative bridge that sets up Hamlet's return to Denmark and the escalating danger of the final act.
Worth knowing
Pirates operating in the North Sea and English Channel were common enough in the early 1600s that Shakespeare could use them as a plausible plot device. The phrase 'thieves of mercy' is Hamlet's characteristic wordplay—oxymoronic compression that turns criminal captors into instruments of providence.
Playing the moment
Since Horatio is reading aloud, the challenge is distinguishing Hamlet's written voice from Horatio's spoken reactions. Let Hamlet's urgency build through the letter—the sea battle should accelerate in pace, then slow for the conspiratorial 'I have words to speak in thine ear.' Horatio's own lines at the end should shift to brisk, purposeful energy; he's a man of action now, not just a reader. Some actors insert small reactive beats—surprise at 'pirate,' alarm at 'fly death'—but don't overplay; Horatio is steady by nature.