Used book – The Druids' Challenge, Evelyne Brisou-Pellen

Sencha, the apprentice druid, returns home to Armorica after a long initiation on the island of Britannia. But fate has befallen the Celtic people, invaded by Julius Caesar's troops. To avenge his people, to preserve the power and secrets of the druids, Sencha decides to fight against the Roman invader. Will the golden torc he wears around his neck give him the strength he needs to accomplish his mission?