Darren Shan 
Lake of Souls [EPUB ebook] 

The tenth part of the Saga of Darren Shan — one boy’s terrifying journey from human to half-vampire to Vampire Prince."If you step through after Harkat, you might never come back. Is your friend worth such an enormous risk?"A terrifying new world, a deadly new challenge for Darren Shan, the Vampire Prince.Darren and Harkat face monstrous obstacles on their desperate quest to the Lake of Souls. Will they survive their savage journey? And what awaits them in the murky waters of the dead? Be careful what you fish for…