Under Jötunheim

by Hubert Mullins

One year after his friend’s death, Malcolm Riker and his fractured team are still living in the shadow of what they lost. Their last mission stopped an out-of-control goddess—but it cost them dearly. When a glacial rift cracks open beneath Östersund, Sweden, unleashing a wave of unnatural cold and awakening something buried in ice, Malcolm is pulled back into a world of myth, monsters, and growing peril.

Skadi, the Norse goddess of winter, has returned—and with her, the first signs of Fimbulwinter. As the eternal frost spreads, ancient protections fail, and a new enemy the Wyrdborn, shadowy figures intent on toppling the Greek Pantheon.
With time running out, Malcolm, Nadia, and Duncan must seek answers in forbidden places and form uneasy alliances. As their journey leads them deeper beneath the world, they begin to realize that the past isn’t finished with them yet. Some powers don’t stay buried. But neither do some friends.

422 pages, Kindle Edition

Published May 8, 2026

Reviews

[Chris Hookway · Rating 5 out of 5]

The fourth installment in Hubert Mullins’s Under a Shattered Olympus series marks a bold shift in the series, introducing a broader scope to the world Mullins has crafted. The narrative explores a fight for a transition of power, as two pantheons of deities fight over who will have supremacy over our world, either the Olympians or the Asgardians.

This book veers away from the formula of the previous entries in the Under a Shattered Olympus series, but does retain some elements. This time though, Mullins ramps up the tension, action and carnage to an 11.

A sudden wave of catastrophic weather engulfs half the world in ice, raising the stakes on a global scale. Building on the lore established in the first three books, this entry expands the mythology as Mullins continues to layer his fictional world with more and more complexity.

Blending dark fantasy, apocalyptic horror, and monster horror, it delivers relentless tension, punctuated by unexpected twists. The result is a fast-paced, harrowing journey filled with chaos, destruction, and even more richly layered lore. In my opinion, each book in the series continues to get better, and I for one cannot wait to see where the story goes from here.

[Miranda Jo · Rating 5 out of 5]

I am so glad this is an ongoing series! I couldn't leave Lizzy, Nadia, Duncan, Malcolm or Berg if I tried. To the End of the map for sure!
This series has become the adult version of Rick Riordans pantheons, with the gore and the sarcastic wit you would find in American Gods. If you love horror, creepy crawlers, mythology, found families, redemption and revenge, this entire series is for you!
As much as I have loved LITERALLY every single thing I've read from this author, this series truly takes the prize.

[Shannon Murphy · Rating 5 out of 5]

Under a Shattered Olympus Saga brings so many elements to the table. It’s suspenseful, full of lore, tragedies and triumphs, outstanding character growth, humor, and heart. Shifting into the Norse mythology realm with Under Jötunheim was so exciting and fast-paced, and yet allowed plenty of space to reconnect with the characters we know and love from the previous books. Their friendships are the driving force of this series and are so well-written. I was thrilled at hearing the series would be continued and had no doubt Hubert L. Mullins would deliver!

[Nila A Estep · Rating 5 out of 5]

This book!!!!!!!

I don’t know how Mr. Mullins comes up with his stories but oh my goodness I am happy that he does!!!!! If you liked the first three books you are gonna love this one!!!!! Can’t wait to read the next two!!!!!!! This book was so worth the wait even tho I aggravated Mr. Mullins about it while I waited!!!!!
Love, love, love it!!!!!!

[Desiree · Rating 4 out of 5]

Another adventure with Elizabeth and Co! Even after multiple installments, it never gets old.

While this one isn’t my favorite (and this is totally my fault) for not following the Norse vs Olympian lore entirely, the blend of mythology and horror is just so interesting to dive into.

Looking forward to the next one!

[David Adams · Rating 4 out of 5]

Every time I think this series is winding down, it ramps back up again! Loving the transition from Olympians to Norse mythology and Elisabeth growing more and more powerful.

If the next book was out yet, I'd be reading it!

[Dakota Bedeski · Rating 5 out of 5]

Amazing

I was waiting for this book!!!! From beginning to end, it was an amazing adventure. I can't wait for August, for under Asgard!!

[William Hartman · Rating 5 out of 5]

Nice

Can't wait until the next iteration in this series. Keep up the bread work sir! And may at be as great as the last ones...

[Brad Walker · Rating 5 out of 5]

The story keeps going! I have enjoyed these books, different take on the gods and the underdogs. The story keeps getting better.

[Trisha Tropiano · Rating 5 out of 5]

Under Jötunheim, which is the fourth book in the Under Shattered Olympus series, releases May 8! I was so sad when Hubert L. Mullins said the series was ending as a trilogy, as I’d really come to love the characters and the entire world he built. It was a very pleasant surprise to hear there would be three more books!

I don’t want to give away too many details for those who haven’t read the first three, but my favourite characters are back for another dangerous adventure. This time they head to Sweden in search of the Norse god Skadi. There’s more death and destruction, more Gods, more monsters, and so much action in this one! I love the mix of horror and mythology, and I highly recommend checking out this entire series!