Current
υ2

Last books finished
Complexity: A Very Short Introduction, by John H. Holland
The World Set Free: A Fantasia of the Future, by H.G. Wells
ρ2
Agent Provocateur, by Gary Russell et al
σ2 (did not finish)
The Number Mysteries: A Mathematical Odyssey Through Everyday Life, by Marcus Du Sautoy
τ2
Roadside Picnic, by Arkadii and Boris Strugatsky
Doctor Who: The Eaters of Light, by Rona Munro

Next books
Lucy Wilson & the Bledoe Cadets, by Tim Gambrell
Wild Cards: Deuces Down, ed. John J. Miller
Pale Fire, by Vladimir Nabokov