Nineteen years ago, an unknown female body sank to the bottom of the river in an abandoned foundry.
Nineteen years later, new bones appeared in the same river area.
On the eve of his retirement, the old detective dug out the yellowed case files and found two unsolved cases facing each other from afar.
The little girl who cried on the shore is now a diver responsible for salvage.
She said: "I am underwater and can see all the secrets that have sunk."
