The Passover Murder (Christine Bennett Mysteries)

FINAL QUESTIONS.
Until someone killed her, the only mystery about adorable Iris Grodnik was why she had never married. But for fifteen years, her strange disappearance and murder during a Passover seder has remained a troubling piece of family history.
So when Iris's relatives ask ex-nun Chris Bennett--now the wife of a New York City cop--to make one last attempt to learn the truth, she reluctantly consents. Iris's old friends and suitors have scattered, and Chris soon suspects that some of the relatives are not telling her all they know about Iris's life and death.
Then, in the dusty depths of a hall closet, she finds an old leather purse--and her worst forebodings about Iris Grodnik's haunting murder begin to be fulfilled. . . .