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

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From the Mixed-Up Files of Mrs. Basil E. Frankweiler
SOLVED: Children's/YA
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SOLVED. 2 kids hide in a bus, sleep at a museum [s]
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This book makes the top ten list of books for kids. It's smart, funny, thoughtful, and never condescending. This could certainly be your book.


Hopefully, Leslie will return soon to confirm that this is solved. Thanks, everybody.
These 2 kids (brother and sister?) somehow hid in their school bus after it's already left the other kids at school, and they get to the museum and start living there.
I don't remember why, or how it ends, but I remember it being a good story... any one else remember this story?