Keepers of the Feather

What we know

Raven-based spy network operating across Barovia; reports intelligence to leadership (Session 12 @ 03:27:12)
Urwin Martikov operates network from Blue Water Inn in Vallaki (Session 12 @ 03:22:20)
Ravens scattered throughout Barovia keep eyes and ears out; small contingent stationed in Vallaki (Session 13 @ 00:23:04)
Blue-feather raven traveled with party to Vallaki; same bird greeted party in inn kitchen (Session 13 @ 00:19:34)
Anti-Baron Vargas Vallakovich resistance allyship; long time since a true ally in the fight per Urwin (Session 13 @ 00:21:05)
Party formalized as friends of the feather—allied outsiders, not full members (Session 13 @ 00:22:16)
Investigating Vallaki disappearances alongside hooded assassin evidence (Session 13 @ 00:23:52)
Promised morning helpers for Party Hideout setup (Session 13 @ 00:21:05)
Mercurio pledged friends-of-the-feather would keep Nightingale's secret (Session 13 @ 03:27:03)
Nightingale is member of allied Monster Hunter faction (Session 14 @ 00:16:53)
Urwin's gruff lone investigator confirmed as Dr. Rudolph van Richten (V) after party cross-matched descriptions (Session 12 @ 02:59:10; Session 17 @ 21:55; Session 18 @ 02:27:19)
Urwin's friendly blue-bird acrobat confirmed as Nightingale after tower intel and church meeting (Session 13 @ 03:02:43; Session 16 @ 01:49:14)

Urwin Martikov — proprietor; network operator at Blue Water Inn (Session 12 @ 03:27:12)
Danika Dorakova — Blue Water Inn staff; works with Urwin (Session 10 @ 00:35:15)

Urwin confessed anti-Baron sympathy and revealed blue-feather spy raven (Session 12 @ 03:22:20)
Kitchen allyship scene; raven network intelligence shared with party (Session 13 @ 00:19:34)

Unconfirmed: full membership roster beyond Blue Water Inn (Session 12 @ 03:27:12)
Unconfirmed: whether Danika Dorakova's role extends beyond inn operations (Session 10 @ 00:35:15)
Unconfirmed: whether Rictavio is connected to Nightingale (Session 13 @ 00:25:59; Session 16 @ 01:49:14)