The Secret Fury (1950)

During Ellen and David's wedding ceremony, a stranger stands up at the phrase "If anyone knows why these two may not be joined...". The stranger announces that Ellen is already married. Ellen insists she is not, and the strain of proving that she is telling the truth pushes her mind towards a breakdown and results in the death of the man she has supposedly already married, among others. Ellen is charged with this death, but David believes in her innocence and sets out to uncover the conspiracy and the reason behind it.