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Watching earlier episodes in season 23 helps you follow the plot and character arcs leading into this episode.

Watch NCIS : Enquêtes Spéciales Season 23 Episode 17 Online

Q: Where can I watch “NCIS : Enquêtes Spéciales” Season 23 Episode 17 online?

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“Sous surveillance” — Watch "NCIS : Enquêtes Spéciales" Season 23 Episode 17 online in HD for free. Check streaming providers, cast, and episode details.

Apr 21, 2026 Season 23 Episode 17 43 min M

10.0 ★ ★ ★ ★ ★

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NCIS : Enquêtes Spéciales Season 23

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Season 23 Episode 17 — Aired on Apr 21, 2026 • runs about 43 minutes.

Directed by Lionel Coleman.

Written by Scott Williams.

Notable cast/guest names in this episode include Sean Murray, Wilmer Valderrama, Katrina Law, Brian Dietzen.

This page includes 1 official still(s) (when available) plus legal availability links.

Looking for “watch NCIS : Enquêtes Spéciales Season 23 Episode 17 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

Après la découverte d’un dispositif d’écoute dissimulé dans un bâtiment fédéral, le NCIS est chargé d’identifier l’origine de l’intrusion. Parker et Knight suivent une piste menant à un ancien spécialiste du renseignement, tandis que McGee tente de comprendre comment le système de sécurité a pu être contourné. Torres, confronté à un comportement suspect au sein d’une agence partenaire, réalise que l’affaire pourrait être plus vaste qu’une simple opération d’espionnage.