finish the quest for foools rush in dragon age 2....... i lost the body now im lost no body to find the where abouts of

From the Wiki:

http://dragonage.wikia.com/wiki/Fools_Rush_In

"Bug! It is possible that when Isabela asks you to search, the bodies disappear and you can not retrieve the note. This can usually be fixed by simply reloading your auto-save when you enter Hightown."