Cache is a micro, has camo attached, inside has logbook only
(dont take to start your own novel!)
The Thirty-Nine Steps is an adventure novel by the Scottish
author John Buchan, first published in 1915 by William Blackwood
and Sons, Edinburgh. It is the first of five novels featuring
Richard Hannay, an all-action hero with a stiff upper lip and a
miraculous knack for getting himself out of sticky
situations.
The novel formed the basis for a number of film adaptations,
notably: Alfred Hitchcock's 1935 version; a 1959 colour remake; a
1978 version which is perhaps most faithful to the novel; and a
2008 version for British television.

John Buchan wrote The Thirty-Nine Steps while he was ill in
bed with a duodenal ulcer, an illness which remained with him all
his life. The novel was his first "shocker", as he called it
— a story combining personal and political dramas. The novel
marked a turning point in Buchan’s literary career and
introduced his famous adventuring hero, Richard Hannay. He
described a "shocker" as an adventure where the events in the story
are unlikely and the reader is only just able to believe that they
really happened.
Buchan's son, William, later wrote that the name of the book
originated when the author's daughter, then about age six, was
counting the stairs at a private nursing home in Broadstairs, where
Buchan was convalescing. "There was a wooden staircase leading down
to the beach. My sister, who was about six, and who had just learnt
to count properly, went down them and gleefully announced: there
are 39 steps." Some time later the house was demolished and a
section of the stairs, complete with a brass plaque -on a post- was
sent to Buchan.--So the story goes.