We didn't know much about the story for
Zack & Wiki: Quest for Barbaros' Treasure except for the obvious ("Hey, treasure! Dude,
let's quest for it!") Thankfully,
Capcom detailed some of the plot in a press release about the game.
Zack & Wiki involves a young pirate named Zack who happens upon the talking skull of the legendary pirate Barbaros. And, like anyone who finds a magically animated skull, Zack decides to do what it tells him. Luckily, it tells him to go on an adventure leading to treasure, which is courteous for a hallucination/undead pirate.
The full press release is after the break. The skull says READ IT! And the animated skull of Matt Casamassina says
BUY THE GAME!