Books like Thor's Serpents
Kelley Armstrong, K. L. Armstrong, Melissa Marr, M. A. Marr
Thor's Serpents is 368 pages, about 6 hours 45 minutes at 250 words a minute.
12 books to read next
How long each takes
Loki's Wolves 6.4 h 
Odin's Ravens 6.5 h 
The Hammer of Thor 8.8 h 
The Sea of Monsters 5.2 h 
The Ship of the Dead 8.3 h 
Against the Tide 4.4 h 
Need 6.2 h 
The Battle of the Labyrinth 6.8 h 
House of Secrets 9.7 h 
Underworld 5.9 h The Assassin's Curse 9.9 h 
Paranormalcy 6.2 h Bar height shows length. Estimated at 250 words a minute.