“The Phenomenon: Under the Hidden Sky” by Robert Allan

The Phenomenon: Under the Hidden Sky

Robert Allan
Liminal House (2026)
ISBN: ‎979-8996935314
Reviewed by Sandra Cruz for Reader Views (09/2026)

What do we really know about UAP, and what happens when we stop dismissing the question and start examining the evidence? Recently, the phenomenon has been renamed from UFOs to Unidentified Anomalous Phenomena, or UAP, after David Grusch’s testimony under oath before Congress in 2023, stating that the United States government has concealed the recovery of nonhuman craft.

J. Allen Hynek, an astronomer from Ohio State University, was hired by the Air Force as a consultant to Project Blue Book, the official UFO investigation program that ran from 1952 to 1969. He was brought in to debunk the phenomenon but eventually went from skeptic to one of the most credible scientific advocates. He created the classification system still in use today and founded the Center for UFO Studies.

Jacques Vallée is a French astronomer who has spent fifty years reviewing the data and still insists that the phenomenon doesn’t fit the frame we bring to it. In 1961, he and his colleagues started tracking objects that they couldn’t understand and presented the file to their boss, who ultimately destroyed it, fearing professional ridicule. Vallée’s viewpoint on the subject is known as the Interdimensional Hypothesis, that the phenomenon originates from another dimension in space.

The Phenomenon: Under the Hidden Sky by Robert Allan is book one in The Phenomenon series that presents the evidence and the long history of UAP. For years, Allan avoided the subject because, culturally speaking, serious people don’t take it seriously. He began questioning his own skepticism after reading documents about it and approaching the evidence as it should be, from both sides: the phenomenon itself and the skepticism surrounding it. In this book, he examines how the subject developed, why it was dismissed for so long, and why it has returned to public attention.

The evidence comes from declassified documents, military encounter reports, and the modern disclosure record from Project Blue Book through the Advanced Aerospace Threat Identification Program (AATIP), the All-domain Anomaly Resolution Office (AARO), and the 2023 congressional hearings.

The subject of UAP has fascinated me for years, and given the recent declassification of documents pertaining to it, I was naturally drawn in. Allan makes it clear that this book isn’t proof of anything; it’s not a conspiracy book or a debunking book. UAP are unexplained, but we have yet to find out exactly what they are. He’s just presenting the evidence and is leaving the conclusion up to the reader.

The Introduction immediately hooked me in. In it, Allan explains how in 1953, the CIA created a panel of five distinguished scientists led by physicist Howard P. Robertson of Caltech. They were tasked with evaluating whether UFOs constituted a national security threat. Their conclusion, in the Robertson Panel report, stated that there was no credible threat but recommended a campaign of systematic ridicule using mass media, advertising, and schools to demystify UFOs.

The material includes six chapters of evidence (what has been presented and recorded), seven chapters of theory (examining the theories that serious researchers have proposed), and four chapters of history (putting the phenomenon into historical context). Each chapter ends with a list of recommended documents for further reading.

Robert Allan also presents readers with the difficult physics surrounding reported phenomena. He introduces several theories, including the extraterrestrial hypothesis and the simulation argument. Allan’s own Layered Phenomenon Model is his attempt to account for the different types of evidence without forcing everything into one explanation.

The chapter on the extraterrestrial hypothesis is interesting because it presents the eternal question: if they’re not from here, where exactly are they from? Another star system in the galaxy? Another dimension? Perhaps from another time or another layer of reality? All the physical evidence is there, but it doesn’t offer clear solutions.

History buffs will appreciate the chapters on ancient texts like the Epic of Gilgamesh, the Mesopotamian Texts, and the Book of Enoch. According to the oldest written traditions, humanity was created to solve a labor problem.

Civilization, in the oldest written record of it, is depicted not as an achievement but as a transfer, itemized, list by list, from a divine holder to a human recipient.

For readers who are curious but skeptical, The Phenomenon: Under the Hidden Sky by Robert Allan is a thorough, evidence-heavy introduction to the modern UAP debate without oversimplifying the subject. It’s less about providing an answer and more about giving them the background and theories they need to ask better questions. And sometimes, the most fascinating books are the ones that leave us with more questions than answers.

The lesson is not that there is nothing to explain. It is that the concealment architecture does not only hide truth. Sometimes it makes falsehood, and it is very good at it.”