You know, I totally get the hunt for free reads—budgets can be tight, and books are pricey! For 'Ctrl-Z,' I'd first check sites like Wattpad or Royal Road, where indie authors often post work. Sometimes older novels pop up there if the author’s cool with it. Scribd’s free trial might also have it, though you’d need to cancel before it charges you.
Another angle: libraries! OverDrive or Libby apps let you borrow ebooks legally with a library card. If 'Ctrl-Z' is trad-published, this could work. Just a heads-up: avoid sketchy sites offering ‘free PDFs’—they’re often piracy hubs that hurt authors. I’ve stumbled into comment sections where fans share legit freebies, too, so maybe dig around Reddit threads or Goodreads groups.