This Starry Deep

Jonah and Shae Madison were the best their generation had to offer. Throwing themselves into trouble at every turn, they spent a lot of their time fighting for what they believed in, saving countless lives. But now, somehow having made it into their sixties, they've happily retired. Until they're forced, this time against their will, to save the galaxy. It's one more time into the deepest black, together. Jonah and Shae were already a force to be reckoned with, but this time they're joined by their son, and that doesn't make them LESS dangerous...
In a galaxy pushing them at every turn, all they have are wit, will, and most importantly, each other to keep them all alive.
And gravity packs.
And blasters.