archytele The Vault
Season guide

Secrecy of the Investigation: Season 15

16 episodes Premiered Dec 14, 2015 Updated Sep 28, 2026
Previously on Secrecy of the Investigation

Season 15 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 14.
  • ⚡ 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.
Advertisement
Advertisement
Season 15 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 15 Progress Shield

Future titles & synopses blurred. Tap "Reveal" on any card to peek.
Binge Efficiency Engine

Season 15: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

19%
81%
Mytharc (3): Crucial lore & season climaxes
Core (13): Character development & subplots
Side Quest (0): Standalone / filler
S15·E1 Mytharc

Episode 1

Dec 14, 2015 · 45 min

S15·E2 Core

Episode 2

Dec 14, 2015 · 45 min

S15·E3 Core

Episode 3

Dec 14, 2015 · 45 min

S15·E4 Core

Episode 4

Dec 15, 2015 · 45 min

S15·E5 Core

Episode 5

Dec 15, 2015 · 45 min

S15·E6 Core

Episode 6

Dec 15, 2015 · 45 min

S15·E7 Core

Episode 7

Dec 16, 2015 · 45 min

S15·E8 Core

Episode 8

Dec 16, 2015 · 45 min

S15·E9 Core

Episode 9

Dec 17, 2015 · 45 min

S15·E15 Mytharc

Episode 15

Dec 22, 2015 · 45 min

S15·E16 Mytharc

Episode 16

Dec 22, 2015 · 45 min

Advertisement