Phenomenal Girl 5, by A.J. Menden, is some sort of romance/adventure book, part of the SHOMI series.
This comes courtesy of Dorchester Publishing, who have been very generous with the freebies lately. This is available at B&N, which we all know is basically US-only.
Synopsis
An up-and-coming superhero finds love with the man assigned to train her—and a plot that will push the couple to the extent of their powers.
A large number of other books have become free in the B&N store lately, but are labelled under Kindle threads, so nook users may have missed them. For convenience, rather than make you click through a dozen or so threads to check if the one you wanted was one of them, I'll be posting a round-up below.
Happy reading!