Unseen, Unheard

When Penn Ross goes missing Clove Mariam and Camare Inovar, his two best friends, grow apart after blaming each other (and themselves) for his disappearance. When an old enemy comes back to talk to them giving them a hope that Penn can still be found they start investigating leads in a new light in ways they never could have imagined before. Is their old enemy tricking them? Will Clove and Camare put aside their differences to help each other and Penn? Is there something more to Penn's disappearance? Will I stop asking questions in this summary? Read to find out! (The last question's answer is fairly evident so I will not be answering that!)