Unlock the secrets of the unsinkable ship... Bertha Watt, tree-climber and would-be polar explorer, is excited to be on RMS Titanic's maiden voyage, as she leaves Aberdeen behind for the glamour of a new life in America. But Bertha quickly realises that some passengers are behaving strangely, and she determines to unravel their secrets. With new friend, Madge, Bertha sets up her own detective agency to try and solve the mysteries onboard, but they have no idea that disaster is looming for Titanic. Can they help Johan find the hidden treasure and unmask the identity of the enigmatic Mr Hoffman before time runs out on the 'unsinkable' ship?