The Good Widow by Liz Fenton and Lisa Steinke

Jacqueline is an elementary school teacher. She thought her marriage was so-so but one day, a police officer shows up to tell her that her husband has died in a car accident in Maui. He was supposed to be in Kansas on a business trip. But that's not it. He was with a lady who also died in the car accident.

Not the most well-written book, but definitely a page-turner.

Another good candidate for some fun summer reading.