About K.L. Armstrong Books by K.L. Armstrong Thor's Serpents by (author) K.L. Armstrong & Melissa Marr Ages 8 to 12 Grades 3 to 7 Odin's Ravens by (author) K.L. Armstrong & Melissa Marr Ages 8 to 12 Grades 3 to 7 Loki's Wolves by (author) K.L. Armstrong & Melissa Marr Ages 8 to 12 Grades 3 to 7