Murder in Malibu Hills: Book 1 of the Zuma Seals Series by Deborah Brown.

Anthony 'Zach' Lazarro just wanted a new start. His ex-wife Lucia took his son, Anthony Jr. back to Italy making his chances of seeing him practically nil. Zach decided he needed a change and California won the coin toss. So, here he is at a stakeout trying to catch an unfaithful trophy wife and out of the blue, somebody conks him on the head! Luckily Cable, a fellow ex Navy Seal, was there when he came to.
This sounds like the start of an action movie in a book. For those living in winter and snow, the description of California sounds inviting.
Have a look?   http://deborahbrownbooks.com/