Sun Wolf

Book 2 in the Space Unbound Series

“Jeffrey’s yarn is a dandy cosmic mystery conceived on the vast scale of an Arthur C. Clarke or Olaf Stapledon epic . . . there’s a gallery of well-drawn, diverse characters that may pleasantly remind readers of Star Trek; a memorably sinister cabal of villains; and even a smattering of romance. There’s also no shortage of imaginative perils along the way. A fine spacefaring adventure story on a macroscopic scale.”
— Kirkus Reviews

Year 2218

Why does a man, haunted by a profound encounter with an alien intelligence and stalked by a devastating addiction, accept an impossible mission to save humanity from certain annihilation? Because he is Aiden Macallan, commander of the Sun Wolf, and those afflictions make him the only person for the job.

After fifty years of enabling human expansion into Bound Space, the enigmatic voidoids are beginning to shut down. No one knows why, or who’s behind it, but one thing is certain: if all the voidoids disappear, not only is humanity locked out of Bound Space forever, but it will unleash a torrent of dark energy tearing our universe apart, from atoms to stars. It will happen soon and happen fast unless Aiden and his hand-picked crew can stop it.

But as they set course for the Frontier in search for answers, someone is trying to stop them, attacking from the shadows at every step of the way. Someone who just might want the destruction of the voidoids to proceed. Now, in a race against time and malevolent forces, light-years from home, the Sun Wolf is humanity’s only hope for survival.

Praise for Sun Wolf

“Quick thinking, scientific acumen, and plenty of guts punctuate Jeffrey’s fast-paced second Space Unbound adventure (after Through a Forest of Stars). . . . Jeffrey’s obvious passion for hard science shines through his immersive worldbuilding, which incorporates a diverse cast, espionage, quantum physics, and epic space battles. This well-plotted sci-fi thriller recaptures the feel of the first book and is sure to delight fans.”
— Publishers Weekly

“The second installment in Jeffrey’s Space Unbound series (after Through a Forest of Stars) follows the crew of the Sun Wolf, a high-tech Science and Survey vessel, on a journey to save the universe. . . an epic space adventure written in the hard SF mode. The plot operates on a grand scale, featuring interplanetary jumping, rogue space pirates, and warring government factions. But, like its predecessor, Sun Wolf really shines on the micro level. Aiden is a likeable, honorable protagonist who commands a diverse crew of scrappy, well-intentioned individuals. . . well-crafted character dynamics add a personal touch to the wide-ranging storyline. . . This detailed space opera with a touch of mystery will appeal to those interested in the science of interplanetary adventure.”
— Publishers Weekly BookLife

“A pulsating page-turner that explores new mysteries and newer horizons, Sun Wolf is an entertaining sequel that holds its own when compared with its much-praised predecessor. Author David Jeffrey introduces a couple of fresh faces into his epic sci-fi saga. He also provides in-depth backstories to his older characters and develops them further. Overall, Sun Wolf was a blast to read. I think it is a must-read for sci-fi fans.”
— Pikasho Deka for Readers’ Favorite

“The second installment in David C. Jeffrey’s Space Unbound saga (after 2020’s Through a Forest of Stars) continues the grand-scale science fiction narrative . . . The hard scientific speculation is consistent throughout; the central characters are deeply developed; the pacing is brisk, and the action irrepressible. . . . fans of hard science will enjoy the story.”
— BlueInk Review

“Sun Wolf is a thoroughly enjoyable sequel in a so-far exceptional sci-fi series. It explores an intricate and complicated world without ever making it feel like work for the reader. And if the conclusion is anything to go by, it’s only going to get bigger and better from here.”
— Joelene Pynnonen for Independent Book Review

“Jeffrey writes in clear prose that often exhibits a beautiful efficiency, bringing SUN WOLF’s futuristic universe to life with a combination of hard science facts (explained with a refreshing clarity) and delicately-handled character beats . . . Smart, entertaining and populated by well-drawn characters–SUN WOLF, the second in David C Jeffrey’s Space Unbound series–is a solid example of hard sci-fi storytelling. Fans of Arthur C. Clarke or Robert Charles Wilson will be delighted.”
— Jeff Somers for IndieReader

“In Book two of his Space Unbound series, author David C. Jeffrey shows boundless imagination, especially when it comes to alien life. . . . Fans of Arthur C. Clarke and Andy Weir will fall head over heels in love with Jeffrey's creativity and non-humanoid extraterrestrials. . . . Sun Wolf is an immensely enjoyable page-turner with action and exploration galore.”
— Ben Haskett for San Francisco Book Review

“A stunning follow-up to the debut of David C. Jeffrey’s Space Unbound series. Jeffrey is unafraid to push on the edges of the sci-fi genre, nor the edges of knowable space. The action sequences are vivid and visceral, and well balanced with character-driven subplots and immersive technical depth. When an author creates a visionary future with this much attention to detail, readers will lose themselves and forget it’s fiction, which Jeffrey accomplishes masterfully with this entry of his riveting and original series.”
— Self-Publishing Review