The US Kindle store has added a listing for the French edition of Secret of the Unicorn. It will go on sale on 1 August 2018. You can pre-order it on Amazon now.
Here’s a translation of the synopsis:
THE MAGES OF AVALON: EMILY AND THE SECRET OF THE UNICORN
Something strange is going on at Ravenswood. Increasing numbers of magical animals from the world of Aldenmor are crossing the passage to escape the terrible Black Poison. Emily is convinced that a wounded creature is hiding in the forest. Despite Adriane and Kara’s warnings, she wants to go looking for it to heal it. But a monster with formidable hypnotic powers seems to follow the young mage … however, Emily doesn’t hesitate to start her pursuit of the frightening creature. But as the three mages cross the passage that connects their world to Aldenmor, they are far from imagining what they will discover…