Mira Calder races to figure out mystery code names provided by her dying brother.
Mira, upset at the death of her brother finds a rogue salvager at a North Sea oil rig and recruits her for a deep-sea investigation.
Mira and Len attempt to decrypt the meaning of a coded message to help solve the mystery of her father.
Mira gets provided coordinates to a mysterious location whilst action escalates on the surface.
Follow Mira as she realises the weight of her family's actions in an epic final.
Molly Harvey
Mira Calder
Daniel Harrison
Steward 1
Magnus Ruston
Len
Danny Grant
Isaac Shaw
Laurie Elliott
Steward 2
Dominic Buckley
Rafe Calder
Efan Lomax
Rowan Calder
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