The second book is the prequel to the „To the Rescue“ series. DrT writes:
The story of Tabitha Spellman and the crew that come to fight Voldemort in 1980 and 1996
Largely the story of Tabitha Spellman is told from the time she is found on the Yasgol doorstep in 1968 to the time with the International Confederation in Britain in 1980 and 81.
The story is rated R.
It can be viewed online at Schnoogle.
I made a PDF of its 21 chapters.