A One-Round Adventure Packet for 7th to 9th Level Characters
From the introduction:
When the pirate attacks on merchant ships stopped, the harbormaster of Stormreach was quick to pat himself on the back. Young and brazen, he proclaimed the pirate scourge ended, and the Thunder Sea "100 percent safe" for merchant travel. Even as the reports of strange vessels crammed with rugged-look[ing] refugees from as far as the Lhanzaar Principalities began to circulate, he declined to investigate further. It wasn't until a thick magical fog settled over the city that anyone realized what plot might have been afoot. A massive pirate army, gathered from all corners of Eberron was perched at their doorstep, ready to strike.