Everything starts with an extraterrestrial vessel which undergoes a damage close to the Earth. Superman makes it possible for the incident not to turn into catastrophe and, once its investigation carried out, he decides to bring back the dead alien to his home planet so that he can buried and celebrated as a hero.
During Superman's absence, Maelstrom, a young woman of Apokolips, arrives on Earth. She has decided to become the only lover for Darkseid and wants to bring him a true present: the head of his enemy, Superman. But she meets Supergirl first and Kara understands quickly that she's not powerful enough.
Superman sets a small picnic with her cousin on a remote planet in order to teach her some important things while Maelstrom, who's sent back on her planet, will have to show a certain strength of character.
Palmiotti and Gray (right spelling here) give us some space adventures, allowing Kal-El and Kara to know each other better. Superman seeks to teach her cousin that having powers has consequences. So no, that's not the "With great powers, come great responsibilities." trip but rather how to manage failure. And Superman's methods are quite blunt this time.
The Maelstorm's part is quite but not frankly essential, I was not very interested about the whole warrior story, even if, as usual, writers manage to make readers feel some affection for her, thanks to her sturdy character and self-confidence.
A good story fabulously illustrated by Phil Noto. I was not very big fan of his previous works (especially his Danger Girls comics) but I read this new work with a great pleasure. I even found his pages even better, thanks to his great coloring.
Having a nice ending, Maelstrom is a good Superman and Supergirl's story about what means to "be a hero day in day out". So OK, it is completely separated from all that occurs in the DC universe, but I've read that book with much pleasure.