10 is too restrictive. Here are a few summaries in 15 words or less.
What you get if you crossed the best parts of LOTR and Saw
Primary Colors crossed with Willow crossed with Girl With the Dragon Tattoo
Bunch of jerks fight for throne while undead creatures threaten to destroy all of humanity
Clever dwarf deals with a-holes but just wants to hang out with his hooker wife
Literally and figuratively brothers and sisters screw each other and fight to become kingdom ruler
Greatest TV intro of all time plus boobs and gore and talking