This is the legal version of "Google Drive." Most public libraries subscribe to Libby (by OverDrive) or Hoopla.
If you just need a quick fix, Rachel Renée Russell’s official site offers free, high-quality PDFs of the first 40 pages of every new release. This is legal and safe.
While you might find a link promising a "high quality" PDF, here is what you are actually risking:
You want the high quality. You want the convenience of digital. And you don't want to pay $15 per book. Here is the ethical roadmap to happiness.