Two girls and a mystery #977896

Barbara Winters had been reading in the alcoved window seat, half
hidden from the rest of the cozy living room. It was really an exciting
book, borrowed from one of the girls at school. But, alas, Barbara had
fallen asleep just in the most exciting part of it.
 
She was roused, how much later she could not tell, by the sound of
familiar voices.
 
Drowsily, half asleep, she listened for a moment before realizing that
the conversation was not intended for her ears. Then it was impossible
to escape without betraying the fact that she had overheard. Still half
drugged with sleep, Bab lay still.