ABC, E for Einzigartigkeit (uniqueness)

inzigartigkeit, uniqueness.
u-nique [yoo-neek], -adjective (Definition by dictionary.com)
1. existing as the only one or as the sole example; single; solitary in type or characteristics. 2. having no like or equal; unparalleled; incomparable. 3. limited in occurrence to a given class, situation, or area. 4. limited to a single outcome or result; without alternative possibilities. 5. not typical; unusual.

96.500 books were published in the year 2007, whereas 86.000 titles were new publications - only in Germany! (Source: http://www.boersenverein.de/, Buch und Buchhandel in Zahlen)

I read my lines, think of my plot and I get the feeling, that there is nothing unique in there. Everything has been here before in a similar way. It's like in that song of the German group 'Die Prinzen':

German refrain:	English translation:
Denn das ist alles nur geklaut, (eo!, eo!) das ist alles gar nicht meine. (eo!) Das ist alles nur geklaut, (eo!, eo!) doch das weiß ich nur ganz alleine. (eo!) Das ist alles nur geklaut und gestohlen, nur gezogen und geraubt. 'Tschuldigung das hab 'ich mir erlaubt.	Because it's all just stolen, none of it's mine. It's all just stolen, but I'm the only one who knows. It's all just stolen and lifted, just copied and robbed. Sorry, I took the liberty.

Karin's cuisine offers as current specialty a young 'Jane Austen' woman going on a ship, doing the 'Robinson Crusoe' on a 'Pirates of the Caribbean' island. Then becoming a female 'Indiana Jones' with a touch of 'Lara Croft' and spiced up with a touch of a mysterious curse.

Who should want to taste this, if the ingredients are already known? Just because the recipe is new? Or the way of flourishing and spicing up the dish? Is that the key to uniqueness? To find an unusual, solitary way to combine the familiar?

Do you concern about that topic? What makes your writing unique?