CNN  —  When they wanted, Constance Marten and Mark Gordon could be warm and caring parents. A family judge described interactions with their children as “excellent,” with the two able to act in a “loving and attentive manner.” But a high-profile court case that stunned even seasoned legal figures painted a different picture, of a couple so fixated on each other and suspicious of outside authority they failed to care for their own child. This week, Marten and Gordon were found guilty of