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.
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.
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.
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.