The Switch by Joseph Finder

I’ve always enjoyed Joseph Finder’s books and I don’t think I’ve missed any.
Like most writers in this genre, he’s created a recurring hero, Nick Heller, a Special Forces intelligence investigator (who does not appear here), but the majority of his novels are standalones.
In The Switch, a simple mix up throws one innocent man into the crosshairs of sinister government secrets and ruthless political ambitions.
“Michael Tanner is on his way home from a business trip when he accidentally picks up the wrong MacBook in the TSA security line at LAX. He doesn’t notice the mix-up until he arrives home in Boston, but by then it’s too late. Tanner’s curiosity gets the better of him when he discovers that the owner is a US senator and that the laptop contains top secret files.” (JosephFinder.com)