Very disappointed. I was hoping for a cute grandma detective book but this is not it. 

The main characters are insufferable, the way people are written is so odd, and the female characters are described weirdly. 
The male main character complains about women, their attributes & temperaments often.

He also said this, which is a big red flag for me:
"I always loved hiring young secretarial trainees from there. The name was so apt. And they were lovely girls. It was the perfect training ground for Sterling & Sterling. There's nothing like a Catholic school education to teach you how to conform."

TS and Lil end up making the murder of TS's boss a race between them & the police to see who can figure it out first. 
There are many blunders on both sides along the way, and an old crime ends up being the reason for the multiple murders.
The book was a lot darker than anticipated and I did not enjoy it one bit. 

here is a recap so you dont have to read the book. the senior partners at the bank got drunk when they were young, raped and beat a young secretary (Patricia) who worked there and then had the management cover it up. She gave birth to a daughter, gave the child to her best friend, then was commited to a mental institution by the HR guy. She died in the mental hospital 30 years later, having finally told her BFF what happened right before she passes. Her friend (who she gave the daughter to) goes on a rampage and kills the men who hurt Patricia, except for one because she was caught before she could finish her list.