A review by anbar
The Sea of Trolls by Nancy Farmer

3.0

Viking-age historical fantasy suitable for middle school and up (some pillaging and peril, like when the main character and his sister get kidnapped by vikings, no swearing or detailed gore or sex). Another reviewer pointed out the presence of multiple religions (the protagonist's Christianity, though of a fear-and-hellfire sort from his father who is bitter to have not become a monk; the Bard's Irish animism; and the vikings' Norse mythology), which sometimes clash or somewhat mishmash in the thoughts of the teen exposed to all three from his different mentors in a way that feels believable and sometimes even funny, though the story never gets preachy; religion is not the focus here, the adventure and quest to get home is.
Recommended for readers in the transition from kids' to teens' fiction, or even adults who are looking for a good old-fashioned yarn. This is the first in a series, but it wraps up well enough that you could stop here if you want to without feeling like you're cutting off a story.