The Book of the Still
If you are looking for the Eighth Doctor Adventure novel see, The Book of the Still (novel).
The Book of the Still is a 'life line' for time travellers who have gotten stuck or stranded. A user of the book need only write their name and a description of where and when they are, then wait, in the future would read their entry, travel back in time and rescue them. Finders wee rescueers, while seekers were time travellers in need of rescue.
The Book of the Still was made from super strong taffeta, which is constructed by running a thread of the Universe's substratum through the taffeta creating something which is one part taffeta and nine parts baseline reality. It was about 100 pages long bound in cracked grey leather with gold leaf words etched into the cover.
At some point The Book of the Still was removed from temporal circulation and placed within the Museum of Locks on the planet Lebenswelt.(EDA: The Book of the Still)
