The Use of Heavy Water (Valence Chronicles)

Décor don't usually go on vacation, but after their adventure in the Iota Cloud, Pet is looking forward to a week of relaxation on the planet Syzygy, an ideal vacation spot for aliens from all corners of the galaxy. The fancy resort they've chosen isn't welcoming to ship-dwellers, but defying societal expectations has always been a favorite pastime for Desmodian, Brog, and Xavis. However, a divide is sparked in the trio when shadows from Brog's past make an unexpected appearance. Distracted by their conflict, the three are left vulnerable to an enemy who knows their weaknesses. The trio can't save Pet this time. It's up to him to rescue the ones he loves and return them all to their true home among the stars. If he fails, their freedom and maybe even their lives will be forfeit.