een-aged Zoe Stock,a brilliant pianist,is attending a music school run by the Fielding family when she believes she sees a woman drown herself in the river,having left her baby on the bank. When the police arrive there is nothing to support her claim but Barnaby recalls that a mystery woman died in identical circumstances eighteen years earlier. Her body was found by Catholic priest Father Gregory,outside whose church an attempt is made to kill Zoe. A lucrative prize awaits the young musician adjudged the best by the Fieldings and it is assumed that another student is responsible.

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