( Season 1 )
During their holidays, Marika, Annie and Francis learn that the old mill is haunted... Rumours of a hidden inheritance, a mysterious young boy and secret messages. As they head off to follow every lead they're certain of one thing, the summer will be an eventful one for the apprentice detectives.

Directed by: Yann Tanguay (season 1, Canada, 2018)
Cast: Marielle Guérard (Marika), Alice Madore (Annie), Nicolas Germain-Vien (Francis), Nathalie Cavezzali (Carole), Yann Tanguay (Hubert), Brigitte Soucy (Catherine), Blaise Tardif (Marc)
Based on the book by Lucia Cavezzali