Mercy is the second Jodi Picoult book of Sands that I have read and I must say that I enjoyed it way more than Perfect Match. Primarily this is because the core subject matter, a mercy killing, was far more appealing to me as a topic.
It wasn’t a book that I couldn’t put down so I tended to only read 5 or 10 pages at a time so it took a while, but the plot wasn’t so involved that you forgot what was happening from one week to the next.