Mystery and romance. I read this about 2016-17. The book is about a female investigator, detective, agent, I don’t remember specifically what the profession was but she solves mysteries.

[Naomi]

The protagonist marries the older guy in the end of the book. She sets her pilot friend up with another woman. There’s also a cat if that helps. I think he was the cat of the protagonist but the pilot best friend was taking care of it while she was gone. This is also the last book of the series. She goes to solve a mystery involving a famous or affluent family. She has two love interests who want her to be with them. One guy is a pilot who is also her childhood friend and the other is an older guy who is kind of in the same profession she is. They work together kinda. The protagonist marries the older guy in the end of the book. She sets her pilot friend up with another woman. There’s also a cat if that helps. I think he was the cat of the protagonist but the pilot best friend was taking care of it while she was gone. This is also the last book of the series.