Signal in the Dark is a 1946 book by Mildred Wirt. It is the fourteenth installment in the Penny Parker series.
This books contains examples of:
- Nice Job Breaking It, Hero!: Penny ends up tossing the camera containing pictures from the fire into a passing car to keep it out of harm's way. However, this leaves The Star with no pictures and her with the wrath of Mr. DeWitt.