Book excerpt: "The Institute of Science and International Security’s new book Iran’s Perilous Pursuit of Nuclear Weapons chronicles the Islamic Republic of Iran’s efforts to build nuclear weapons. The book draws from original Iranian documents seized by Israel’s Mossad in 2018 in a dramatic overnight raid in Tehran. The “Nuclear Archive” allows deep insight into the country’s effort to secretly build nuclear weapons. The book relies on unprecedented access to archive documents, many translated by the Institute into English for the first time. The first part of the book concentrates on Iran’s crash nuclear weapons program in the early 2000s to build five nuclear weapons and an industrial complex to produce many more. By 2003, responding to growing pressure from European powers to freeze its publicly known nuclear programs and fearing a possible U.S. military attack, Iran’s leaders decided to downsize, but not stop, their secret nuclear weapons effort. The second part of the book discusses Iran’s nuclear path post-2003, revealing a careful plan to continue nuclear weapons work, overcome bottlenecks and better camouflage nuclear weapons development activities. Since 2003, the Islamic Republic’s nuclear scientists and weaponeers have concentrated on establishing capabilities to make weapon-grade uranium and developing more reliable, longer-range ballistic missiles."--Publisher description.