Back in Brittany, Captain Morgane Ledantec is confronted with the discovery of human bones after the fall of a sacred oak during a storm. The victim was a follower of druidism which Morgane was introduced to as a teenager by her godmother.

Évelyne Bouix
as Morgane Ledantec

Jeremy Banster
as Jeremy Laubier

Myriam Bourguignon
as Clara Lambolay

Yannig Samot
as Bernard Favel

Nathalie Besançon
as Nathalie Pérec

Martine Chevallier
as Katel Mahé

Arthur Choisnet
as Erwan Ledantec

Alwena Brehin
as Flora Longhlin

David Brécourt
as Beraud Legoff

Angelica Sarre
as Inès Leroy