Season guide
Secrecy of the Investigation: Season 21
24 episodes
Premiered Dec 13, 2021 Updated Sep 28, 2026
Previously on Secrecy of the Investigation
Season 21 Lore Primer
Key plot threads, lore context, and character stakes you need to remember before diving into this season.
- Directly follows the overarching narrative developments of Secrecy of the Investigation Season 20.
- Faction dynamics and core character alliances shift under escalating external stakes.
- Crucial mysteries introduced previously reach key turning points and narrative reckonings.
- Sets up serialized story arcs that build directly toward the climactic season finale.
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Season 21 Episodes
Episode Guide
🛡️ SPOILER SHIELD
Season 21 Progress Shield
Future titles & synopses blurred. Tap "Reveal" on any card to peek.