not that hard I think. Depends on how you want him to lose and capture it

It sounds like a lot of fights, which is easier to code in than dialogs that link each other
new storyline for potc build mod 14 alpha 10
american spy in brittish port of port royal,current gofer for govner.capt of a medium sized vessel.
story starts after govner request the gofer to escort a important ship from nevis island to antigua naval base to be refitted.
as aid to the govner our hero has unlimted access to antigua long as he has the right papers.
in antigua while talking with a few of the soldiers one of the govners other aids comes up to our hero and aressets our hero for being a spy.
In route to jamica our hero manges to break free of the brig of the small cutter he's being transported on.with the help of a few members of the crew who want to join him.
he takes command of the ship and heads to a friendly port.tells govner what happened and that the ship he was escorting must be stopped.
The govner agrees to help but can only aid him with 1 capt at the moment.capt of a snow.thier 1st step is to find out where the ship is now.
so they decide to sail to port royal and sneak into the govner mansion and find out what they can.they learn the ship is headed right now as part of a fleet
to take control of the friendly port.they race back to warn the port bout the impending attack.
they also learned the hero's ship is part of the fleet captined by the aid who found him out.the hero decides now would be a good time to get his revenge
and get his ship back.after a long battle and near defeat the port manages to turn back the brits and our hero gets his ship back.he decides to keep
the aid alive to use as leverage against the govner of port royal.the govner of the freindly port sees this as a good time to add insult to injury
for the brittish and commands our hero and his friend to capture the brittish port of bridge town.unfortuntly the govner can only offer
a frigete to the capt of the snow with a few soldiers as crew since most ships were heavly damnaged in the attack.
sorry bout the spelling,i've never been very good at spelling so i make lots of mistakes.hopefully that's easier to read.
that's what i have written so far.if i can mange that it's be good enough to start off with,i just need to decide where to go from there lol