Silok was 22nd century Vulcan man who served as an agent of the V'Shar. In the 2150s, Silok was a chief investigator in that organization.

Silok learned from his intelligence sources that the Romulans had established a significant starship building facility and research center in the Achernar system where they developing their advanced warp 7 program. Their analytical division later determined that the Romulan Star Empire was within a matter of months before they achieved a breakthrough in this field. Thus, the V'Shar decided to use covert means, involving Commander Charles Tucker III to destroy the Romulan facility to impede their development program. (ENT - The Romulan War novel: Beneath the Raptor's Wing)

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Spoiler warning: Plot and/or ending details follow.

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In 2158, Silok resigned as head of the V'Shar because it was revealed that Romulan spies were working under his command in the V'Shar. (ENT - The Romulan War novel: To Brave the Storm)