Gay's chum Gillian Culver tells Jacynth about an adventure that she had with her brother Hawk (real name Peregrine) at their home, Culver's Hold, when a German spy passed herself off as their cousin.
Gillian says that Mrs. Maynard "is going to make it into a book some time, only changing the names, of course."
Just as THE LOST STAIRCASE is mentioned in CHALET SCHOOL GOES TO IT / CHALET SCHOOL AT WAR as being told to Jo Maynard by a Chalet pupil, this story was later published as Elinor Brent-Dyer's CHUDLEIGH HOLD.