This Dark Endeavor by Kenneth Oppel

The is the story of Victor Frankenstein when he was a teenage boy. Victor's twin brother, Konrad, is dying. Victor and his friends are desperate to heal Konrad. They make frequent trips to the The Dark Library, attempt alchemy and ancient remedies, and consult with a man with a questionable past. This is fascinating interpretation of the young Dr. Frankenstein. It is modern story with plenty of adventure and romance. This is the first book in the series.