La conjuration d'opale

In La conjuration d'opale (2006–present), a single-issue comic from the Belgian publisher Boulevard des Bulles, the story unfolds as a self-contained mystery or adventure, likely centered around the titular opal conspiracy. While the series has only one issue to date, it stands as a concise, standalone entry in the publisher's catalog, notable for its focused narrative and the creative team's ability to deliver a complete tale within a single volume.