Darkside: A Novel - Michael Mammay

In this thrilling, action-packed fourth installment in the Planetside series from acclaimed science fiction author Michael Mammay, retired Colonel Carl Butler gears up for another military investigation, full of danger, corporate intrigue, and tech people would kill for-perfect for fans of John Scalzi and Craig Alanson.
Colonel Butler has paid his dues and just wants to enjoy his retirement on a remote planet. But the galaxy has had other plans. He has been roped into searching for a politician's missing son and an industry magnate's missing daughter. He has been kidnapped, violated numerous laws, and caused the destruction of colonial facilities. He's famous-or infamous, depending on who you ask-praised and reviled in equal measure across the galaxy for his exploits.
And he is determined to never let the government drag him into another investigation.
But when a runaway twelve-year-old girl whose father has gone missing asks him for help, well.it's a lot harder to say no.
The girl's father, Jorge Ramiro, was supposed to have been on Taug, a moon orbiting the gas giant Ridia 5, working on a dig with a famous archaeologist. But now there's no sign of him and no record of him being there. Mining operations on the moon are run by two different consortiums, Caliber and Omicron-both of which have tried to kill Butler in the past. Butler doesn't believe in coincidence.
Landing on Taug with his right-hand man Mac, computer genius Ganos, and an elite security squad, Butler soon finds that they've charged back into the crosshairs-because Ramiro is not the only who has disappeared, and the perpetual darkside of this moon is hiding more than the truth about a missing archeologist.