Knock Three Times

THIS story really begins with the arrival of a brown paper parcel addressed to Molly, but while the postman is bringing it along the road, there may be just time to explain about Jack and Molly’s birthday, so that you will understand why Molly sat down to supper wishing earnestly that silver bangles were considered useful and necessary presents.
Jack and Molly were twins, and this was their ninth birthday. Such a happy, exciting day it had been; it felt like a birthday all day long, so you can guess how jolly it was, and how special it made Jack and Molly feel. Little did they guess what a weird and mysterious end to the day was now approaching!
They had received a number of beautiful presents, and, to their unbounded joy, a fine new bicycle each from Mother and Father. But there was one particular thing that Molly had wanted for her birthday, and that was a silver bangle.
“Like Mother’s,” she had told Jack, “only silver. One that nearly slips off when I hang my hand down and that I have to push back up my arm—and it jingles.”
As there