In September 2022, Scandinavian seismologists detected what seemed to be a huge undersea earthquake or volcanic eruption. These signals were caused by several devastating explosions that destroyed Nord Stream, the $20 billion pipeline carrying cheap Russian gas to Europe under the Baltic Sea.

The mysterious blasts shifted global geopolitics, disrupted European economies and triggered a manhunt that strained relations within the NATO alliance. Despite capturing the imagination of millions, the mystery of who blew up the pipeline has so far gone unsolved – was it the CIA? Was it part of the shadow war between Russia and the West? Could Putin himself have been behind it? Drawing on years of first-hand reporting and exclusive access to key players – including the saboteurs, the investigators and high-level intelligence – this deeply reported non-fiction thriller by an award-winning Wall Street Journal correspondent reveals the true story behind one of the most remarkable geopolitical mysteries of our time.