Les Sept Boules de cristal
Biographer Benoît Peeters described "The Seven Crystal Balls" as "the most terrifying of "The Adventures of Tintin"". He believed that in this story, Hergé had come under the clear influence of Jacobs, in that the "décor grows more lush; the details clearer. No more streets suggested by a few lines, monochromatic posters, or characters walking on the edge of the frame". Elsewhere, he noted that in this story, Hergé "produced a gripping tale that went further than any other in the direction of the supernatural".