First in the Sons of Destiny series-now in mass market.

To avoid tempting destiny, four sets of twin mage-brothers are exiled to Nightfall Island, where females are forbidden. But when the youngest rescues a woman from another universe, their world is altered forever.

שם הספר
The Wolf (The Sons of Destiny, Book 2)
The Master (The Sons of Destiny, Book 3)
The Cat (The Sons of Destiny, Book 5)
The Flame (The Sons of Destiny, Book 7)