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

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The Peculiar
SOLVED: Children's/YA
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SOLVED. Illegal fairies? in steampunk city, main kid & sister r both such. older sib must work for food in disguise despite danger. young sister hides in house in a hatch in wall/floor. main kid sees old lady step thru a magic portal & follows. [s]
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PS: i am remembering a cover, possibly, but i might be accidentally confusing this with another book. a name, too, but once again this might be a second book, which is why i separated these details. ok so the cover had a steampunk, brass bird with wires and gears sticking out. black feathers fall over an aerial view of a steampunk city. the sky is blue, the back of the book and the borders were gold or tan, maybe. the name im remembering is bartholomew. that's all i got.