Description :
While Nils and his two friends are waiting for Gus'uncle at Sinain station, they witness an incredible scene: the train passengers have vanished! When they reappear, they are all wearing clown wigs and remember nothing. Except that one traveler is still missing: a famous writer.

In the following days, other artists disappear under equally strange circumstances. Each time, the culprit seems to be an elusive, evil clown who erases the memories of everyone he encounters.
Determined to unravel this mystery, the three friends set out in pursuit. Since Loki, the Guardians of the Portals have never faced such a dangerous enemy!