This Dark Endeavour

This Dark Endeavour : the apprenticeship of Victor Frankenstein by Kenneth Oppel

Wow! just finished and yes WOW. From the opening chapter, I was hooked, dark, mysterious, historical, brothers, jealousy, love, action/adventure, magic, villans. Hooked yet? If not -here's the summary from the book jacket.

The purest intentions can stir up the darkest obsessions.
Sixteen-year-old Victor Frankenstein leads a charmed life. He and his twin brother, Konrad, and their beautiful cousin Elizabeth take lessons at home and spend their spare time fencing and horseback riding. Along with their friend Henry, they have explored all the hidden passageways and secret rooms of the palatial Frankenstein chateau. Except one.
The Dark Library contains anceint tomes written in strange languages and filled with forbidden knowledge. Their father makes them promise never to visit the library, but when Konrad becomes deathly ill, Victor know he must find the book that contains the recipe for the legendary Elixir of Life.
The elixir needs only three ingredients. But impossible odds, dangerous alchemy and a bitter love triangle threaten the quest at every turn. Victor knows he must not fail. But his success depends on how far he is willing to push the boundaries of nature, science and love - and how much he is willing to sacrifice.