What's the Name of That Book??? discussion

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The Wikkeling
SOLVED: Children's/YA
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SOLVED. Childrens or YA novel with creepy thin man-like creature, includes many silhouette illustrations. [s]
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The book was about children who lived in a fictional town where there was lots of advertising and consumerism, and lots of new technology. When a car stopped in traffic, the car in front of them would begin to display hologram ads. The children were haunted by a disturbing creature; I remember it looking like a bald man, except super long and lanky with long fingers and a too-small mouth. I also think it wore a yellow night suit. The creature, called "The W-" only appeared only to the children and could give them a fever by poking them with its long fingers. I think it was also attracted to technology.
I don't remember any more about the plot, except that the kids somehow escape the creature in the end. If you recognize anything in this post, please respond. I have been looking for this book for over a year, and would be grateful if you could help me out.