Calla's disappearance leads her family and friends to suspect that she’s lost. In a desperate attempt to find her, Valcas seeks help from a man he betrayed. A new search begins, one that sounds promising, even if it forces Valcas to confront his past.

The travel team reunites for a mission they never saw coming: a journey to a world caught between life and death, and hidden within the deepest recesses of time. Ivory rediscovers a friend and Ray learns the meaning behind his tattoo. But the connections they make between travelers and the lost may twist the core of the Time and Space Travel Agency inside out.