Deep Gravity — Gabriel Hardman

He didn't get onto the most lucrative interstellar mission for the money--Paxon came to be reunited with the woman he loves. But his high-stakes journey takes him to a savage world full of the galaxy's most dangerous game, where the gravity can turn your bones to powder. And the reunion isn't all he hoped for, when they find themselves on a ruined vessel in a deteriorating orbit above the planet, trapped with their own alien prey on the loose.