Widow's Web

Couldn't stop reading it once I started. One of the best suspense novels by Ursula Curtiss
The widow was a KILLER.
Martin Fennister's death was officially listed as a suicide.
Annabelle his widow inherited a mere 30,000 dollars.
Then Gerald Mallow died in a mysterious accident automobile accident.
He had a lot of money and he left it all to his beautiful secretary.
The secretary was Annabelle!
This is the story of a man who set out to trap Annabelle.
He swore he would make her confess to double murder
It has a smash ending that will take even the most experienced reader of mystery fiction by surprise-Boston Herald