The Sea of Trolls is a fantasy novel for children, written by Nancy Farmer and published by Atheneum in 2004. It inaugurated the so-called Sea of Trolls series, which Farmer continued in 2007 and 2009.The Sea of Trolls is set in A.D. 793 in Anglo-Saxon England, Scandinavia, and the mythical realm of Jotunheim.
Captured by Northmen (Vikings) when they raided their village, Jack and his younger sister Lucy (ages 11 and 5 at the beginning of the book) are to be sold as slaves as soon as they reach land. On board the Viking ship Jack meets, and ultimately, befriends Thorgil, a young berserker.
