1. Chapter 1: Endurance

On the shores of Cape Mercy, a skillful group of teen divers investigate a series of secrets and signs after one of their own mysteriously goes missing.

2. Chapter 2: Flower of the Sea

While the town searches for Lauren, Dive Club begins their own investigation. Izzie finds Lauren's phone, which contains a hidden message suggesting her disappearance was no accident.

3. Chapter 3: The Rising Sun

The girls break into Lauren's house looking for more information and find an old coin belonging to Hayden. Izzie finds a diamond brooch in Lauren's wetsuit.

4. Chapter 4: SS Gothenburg

Dive Club discovers that Hayden's coin has some significance and that Lauren was communicating with a mysterious person named LK

5. Chapter 5: The Adelaide

It's the day of the cabaret fundraiser and Dive Club discover who the mysterious LK is.

6. Chapter 6: Dimitri Donskoii

Dive Club and LK receive a distress call and embark on a rescue mission. Could it be Lauren?

7. Chapter 7: Mary Celeste

With the town of Cape Mercy believing Lauren is dead following the discovery of her sailing jacket, a memorial is held in her honor.

8. Chapter 8: RMS Republic

Dive Club and Leonid dive the dangerous Russian shipwreck causing dire consequences.

10. Chapter 10: Admella

Viktorya shares a family secret with Anna. Hayden tells Henry he's found a way to pay off his debts. Izzie steps up her relationship with Henry and Maddie finds a painting that changes everything.

11. Chapter 11: Black Swan

The Salvation Day celebrations begin, and the town is in good spirits. All that changes when a SOS flashes out from the lighthouse. Is it Lauren?

12. Chapter 12: Queen Anne's Revenge

The truth is pieced together as one of the girls is forced to choose between friends and family.