There are 5 books in the The Superheroine Collection series. The newest book is A Lover's Mercy which came out in 2019.

2
The Power of Mercy

Book cover of The Power of Mercy
To her family, Mai Redstone is weak. Her shape-shifting power is nowhere near as impressive as their abilities to literally alter the world around them. But when she puts on the costume to become Mercy, a rooftop-climbing chameleon with a thousand disguises and at least nine lives, she feels almost…
For superhero Swiftwing, crime fighting isn’t her biggest battle. Nor is it having to meet the demanding whims of Hollywood screen goddess Gwen Knight as her mild-mannered assistant, Ava.It’s doing all that, while tracking a giant alien bug, being asked to fake date her world-famous boss, and realizing that she…

4
Shadow Hand

Book cover of Shadow Hand
A mysterious stone figure of the goddess Ishtar, long-buried in the desert, bestows on US Army Lieutenant Ashton the power to move objects by her mind alone. Ash must learn to control this impressive power, before it controls her. She turns to her tough, steadfast lover Cleo, with talents of…

5
A Lover's Mercy

Book cover of A Lover's Mercy
A gripping, sexy, lesbian superhero novel that will leave your heart pounding at its powerful conclusion. This sequel to The Power of Mercy can also be read as a standalone story.Mai Redstone prowls Atlanta as its hero, Mercy, trying to save people from themselves and each other. With her newly…