The Demigod Files
Rick Riordan
Percy Jackson and the Olympians (4.5)
Elementary Cryptanalysis: A Mathematical Approach
Abraham Sinkov
The History of Time: A Very Short Introduction
Leofranc Holford-Strevens
Very Short Introductions (133)
Computer Science: A Very Short Introduction
Subrata Dasgupta
Very Short Introductions (466)
Silence
Becca Fitzpatrick
Hush, Hush (3)
Hush, Hush
Hush, Hush (1)
Finale
Hush, Hush (4)
Crescendo
Hush, Hush (2)