Seeing at plots are okay so long as their no meat to it-
Dragon Marked Houses fear something is brewing out there that is aimed at destroying them. As you begin to do research it becomes clear that the Emerald Claw is involved. Several assassinations are done of high ranking dragon marked family members. You are sent on a information seeking adventure to Marguul Pass to sneak on board the trapped Breland land fortress to locate notes from a war veteran. Youi have 1/2 the Darguun nation chasing you.
The journal found has information involving Dragon Marks within the Seawall Mountains. At this point, you relieze you are being shadowed by someone or group other than the Emerald Claw.
A new threat occurs. There is suggestions of betrayal within the houses. House vs House, member vs member.
More clues bring you to a hidden and very secretive place where there are powerful Dragon marks that the Dragons refuse to read. You go there to get the info and return. Next step- the Dragon islands.
At this point, strange and even bizzare things occur. You run into people with aberrant dragon marks but of a similiar design.
Suddenly the Dragons are becoming aggressive and acting unexpectedly. To make matters worse- Dragon Marks are becoming unreliable. Sometimes they work, other times they don't. Some members become crazed and must be stopped.
Now Vol (herself a Dragon marked house member) comes to you to form a truce to end this threat. She informs you that during the War of the Mark there was a strong mark developing. It was the mark of CHAOS. Their motto is Chaos creates change and change weeds out the weak (or something like that). These members went into exile (either well hidden or onto another plane) and are now out for revenge.
Using their powers or chance and chaos, they are setting the families against each other, nations against each other and by using the PCs, have brought a highly dangerous virus out of a secret location that effects Dragons only. The only force that could have stopped this has been negated.
To top things off, House Xoas (or something like that) has created a new artifact that nutrilizes / controls Dragon marks. They have a means to not only still use their own powers but with a contest of wills, "borrow" another house's power for their own use.
Now near Epic levels, the PCs must battle raging dragons, crazed house members and a very powerful rogue house while the world is on a brink of a new world war (that includes the houses and dragons).
I thought it would be awesome to do and very doable.