Freaky Shadows

Portland was supposed to be a quiet stop for Mystic Caravan, their last stop on the West Coast. Nothing ever goes as expected for Poet Parker, however.
On her first day in town, she sees a shadowy figure on a bridge, and that's followed by a visit from local law enforcement the next morning. It seems women are going missing, but nobody knows what's happening to them.
When Poet digs deeper, she finds another story. This one involves creepy kids in dated clothing harassing people in parks and supermarkets. The kids aren't normal, however, and nobody appears to notice that they're hanging out in places they don't belong.
Poet does a deep dive on Portland's history, but it doesn't lead to answers. She has more questions than anything else.
Who are the kids? Why is nobody missing them?
Where are the women? Are they tied to the kids?
And what's going on in Portland's old tunnel system, the one that was famous because of how many kidnapping victims were transported through it over the years?
Poet is determined to find out, even if the answers just might kill her.