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The military-grade artificial intelligence known as Iona has only one week to live. After that, the UNSC will legally terminate her seven-year existence in order to stave off the threat of the data corruption phenomenon known as “rampancy,” a condition that will eventually take hold of her functionality and persona, endangering all those around her. In a last-ditch effort to save herself, Iona has successfully launched an unprecedented legal appeal against her own death sentence – a case being watched very closely at not only the highest levels of human government, but by others with a very different agenda…
Halo: Saint's Testimony is a digital-only novel written by 343 Industries Franchise Development Director Frank O'Connor. It revolves around the AI Iona and her attempt to save herself from being legally terminated by the UNSC through way of legal appeal. It was released on July 27, 2015. It was also released within Halo: Fractures - Extraordinary Tales from the Halo Canon on September 20, 2016.