Mudrarakshasa is a classic Sanskrit play by Vishakhadatta, and while it's not as mainstream as modern novels, there are ways to find it online. I stumbled upon a PDF version a while back on websites like Archive.org or Project Gutenberg, which often host public domain texts. It might take some digging, but those sites are goldmines for ancient literature.
If you're into Indian classics, you could also check out academic platforms like JSTOR or Google Scholar—they sometimes offer free previews or full texts. Just remember, since it's an older work, translations vary in quality. I personally prefer the one by R.S. Pandit, but your mileage may vary depending on what’s available.