Eastern Standard Tribe

Interesting idea for a novel. People are divided by social media into time-zone cohorts. Unfortunately the idea disappears about a third of the way through the book and never resurfaces. Instead the book settles down into a fairly standard double-cross caper with our hero as the victim but, no worries, it all ends happily ever after and the bad guys get their's in the end (in a short, throwaway chapter). Pity - it could have been so much better.