Book 2 of the Prism Series. Expecting to be returned to their world after the successful retrieval of the red crystal quadrant, Rabbit and Rupert are instead sucked, with Jasper and Aden, into the oceans of Prism. From Undersea to the home of the mer-people, and then to the utter deep and the realms of the slurry, Rupert, Rabbit, Jasper and Aden experience the very best and worst the watery worlds have to offer, as their journey becomes a terrifying quest for the blue crystal quadrant. The Deeper Darkness is book 2 in the Prism series.