7 books in series
George's Secret Key
George's Secret Key is a 5-book series with 7 primary works first released in 2007 with contributions by Lucy Hawking and Stephen Hawking.
#1
2007 • 12 Readers • 321 pages • 3.7
#2
2009 • 2 Readers • 322 pages • 4.5
#3
2012 • 1 Reader • 5
#3
1 Reader • 3
#4
2016 • 3 Readers • 352 pages • 4.5
#5
2016 • 2 Readers • 336 pages • 5
#6
2018 • 2 Readers • 416 pages • 3