An Augmented Reality Game Escalated into Real-World Spy Warfare

For more on Ingress, I thought Tim Bray's blog posts about Ingress were always good reads. https://www.tbray.org/ongoing/ (search for Ingress)

If you find this sort of thing interesting, I'd also recommend checking out Empires of Eve (https://www.empiresofeve.com/) about experiences in Eve Online. I played Eve for several years (including during the period covered in the book) and thought this was a well written 'history book' about what happened then.