For years, serious researchers have known that triangular-shaped UFOs are one of the most common types observed. The phenomenon has sparked intense debate among many and excited the imagination of many others. But until now, there has never been a book-length treatment of this fascinating subject. Finally, we have one. David Marler has provided a comprehensive analysis of “the triangles.” He has collected, collated, and analyzed hundreds of reports. In the process, he has created a detailed profile of these objects and written a rich narrative of their history. Marler is well-suited to the task, having at his disposal an enormous collection of newspaper archives, declassified military reports, UFO books and journals, and the transcripts of many first-hand interviews he has conducted.