The climactic conclusion of a supernatural romantic trilogy starring a savvy, sharp-tongued heroine who taps into ancient Norse secrets. After surviving her (shall we say) intense adventure in Iceland, Katla is psyched to be back for a blissfully uneventful senior year of homecoming and fashion explorations. But her hopes of dodging unfinished business are dashed by the arrival of two Icelandic exchange students: Marik, an oddly alluring merman-in-disguise,...