The Sea of Trolls is the first volume of a fantasy

Fantasy

Fantasy is a genre of fiction that commonly uses magic and other supernatural phenomena as a primary element of plot, theme, or setting. Many works within the genre take place in imaginary worlds where magic is common...

 trilogy by three-time Newbery Honor winning author Nancy Farmer

Nancy Farmer (author)

Nancy Farmer is a prominent children's book author from the United States.Farmer was born in Phoenix, Arizona. She earned her B.A. at Reed College and later studied chemistry and entomology at the University of California, Berkeley...

. The second part is The Land of the Silver Apples

The Land of the Silver Apples

The Land of the Silver Apples is a children's fantasy novel by Nancy Farmer, published in 2007. It is a sequel to The Sea of Trolls, and a sequel, The Islands of the Blessed, was published in 2009. The title refers to Elfland.-Plot:...

(2007), and the final volume, The Islands of the Blessed

The Islands of the Blessed

With The Islands of the Blessed Nancy Farmer concludes the series of novels that began with The Sea of Trolls and continued with The Land of the Silver Apples...

, was published in 2009.
The Sea

Sea

A sea generally refers to a large body of salt water, but the term is used in other contexts as well. Most commonly, it means a large expanse of saline water connected with an ocean, and is commonly used as a synonym for ocean...

 of Trolls is set in A.D. 793 in Anglo-Saxon England, Scandinavia

Scandinavia

Scandinavia is a cultural, historical and ethno-linguistic region in northern Europe that includes the three kingdoms of Denmark, Norway and Sweden, characterized by their common ethno-cultural heritage and language. Modern Norway and Sweden proper are situated on the Scandinavian Peninsula,...

, and the mythical realm of Jotunheim

Jötunheimr

Jötunheimr is one of the Nine Worlds and the homeland of the Giants of Norse Mythology — Rock Giants and Frost Giants.-Legend:...

. The book has impressed critics with its seamless blend of history and fantasy, its warmth, suspense and humor, and the clarity of its prose.

The story begins when Jack, who is a courageous young Saxon boy, is accepted as the village bard's apprentice.