Wells, Carolyn: The Broken O; (1933); v1 1 Jul 2019
 

A Fleming Stone case.

On his honeymoon, a wealthy young man collapses and dies in the arms of his bride. There is no obvious, or even subtle, cause of death, and the verdict is natural causes. But the rumour mills grind, and his distraught bride Perilla is the subject; suspected of murder.

She calls in Fleming Stone.

Taken from the serial edition, and therefore possibly a little condensed. I have not been able to check against a book edition.