On the series debut, Henry organizes a treasure hunt for his grandson Anthony’s 10th birthday, from which Anthony would not return.
Susan and Charles make a mysterious discovery in the park. The investigation into Anthony’s disappearance is reopened after two years.
Luke and Helen continue looking for suspects connected to Henry’s former work. Catherine finds comfort in a terminal patient.
Susan and Charles focus their investigation on one suspect. The discovery of a new clue becomes a turning point in the investigation.
Henry asks Fred for help in decoding the clues left by Anthony’s abductor. Susan makes an important discovery and issues an Amber Alert.
On the season finale, the mystery behind the disappearance is nearly unravelled, and it’s a race against the clock to find Anthony alive.