Once in a Blue Moon (#5)

Previous: Beyond the Blue Moon (#4)

Twice upon a time, Prince Rupert and Princess Julia saved the Forest Kingdom. They have earned the right to live happily ever after. But there’s a blue moon on the rise….

Hawk and Fisher, famous for their years of keeping the peace in Haven, are really quite happy being legends. They gave up the hero business when they decided they’d grown too old for it. Now they run the Hero Academy, training young hopefuls to be heroes.

Legends never die, but it seems they cannot retire, either. Hawk and Fisher’s adult children, Jack and Gillian, have been kidnapped. They were taken by the Demon Prince, an old enemy from the Forest Kingdom who challenges the couple to one final battle for their lives. But Hawk and Fisher believe there’s another motive behind the abductions, one connected to a case they worked in Haven many years ago—a case they refuse to discuss.

They have no choice but to return to the Forest Kingdom, to be Prince Rupert and Princess Julia one last time in one last story—of the kind of things that happen only once in a blue moon….


“ONCE IN A BULE MOON is full of action, intrigue, wild magic, hordes of demons, artifacts of terrifying power, and heroes who are both sometimes brutally bloodthirsty and relatable at the same time. This story is classic fantasy turned to 11, and [exemplifies] Simon Green’s writing style, which manages somehow to be both lighthearted and grim, dark, and brutal […] fans of Green’s writing will find much to enjoy here.”

San Francisco Book Review

“An energetic, engaging and poignant success. The scope of Green’s world and the cast are enormous, but every scene is infused with such touching humanity and delightful wit that it’s impossible not to be drawn along each step of the journey and become a part of every relationship.”

RT Book Reviews

“Quirky secondary characters […] add touches of oddball humor. The political scheming is as important as the magic, blending together for a story with intriguing depth. The sheer volume of information, an occasional swear word, and a few mature references, such as the magical tantric sex classes, make this a good choice for older teens looking for engaging, epic fantasy.”


“His characters have heart and soul, and the whole story, as mad and epic and wild and weird and wonderful as it is, somehow feels intimate and personal for it. [Green has] realized he’d created pure gold, and he’s been striving for that level of perfection ever since. One of the first and and quite possibly the best of Green’s fantasies, this is a book I wholeheartedly recommend to fantasy lovers. Some twenty years after its first release, it remains relevant, exciting, and worth picking up.”

Green Man Reviews

“As endings go, this is about a much a love letter as a writer can create, and well done, too. Recommended.”


“Green does NOT disappoint with this final installment in the Blue Moon novels […] ONCE IN A BLUE MOON is fantastic. There is tons of action to keep readers captivated and entertained, heaps of typical Simon r. Green humor that will have you giggling to yourself, more familiar faces than you could shake a stick at, and at 560 pages readers will get their money worth […] I highly recommend ONCE IN A BLUE MOON to any fan of Simon R. Green and anyone looking for a fun read.”

Whatchamacallit Reviews


Publishers Weekly

Awards & Accolades