Tell No One by Harlan Coben

An exciting, holiday thriller with lots of punching in the solar plexus and descriptions of glocks. Hugely unrealistic but good fun. It is about a couple who are attacked one evening at a remote lakeside cabin - 8 years later, what really happened starts to unravel.... This book teaches us that one's relationship is as nothing unless you have a set of code words for use in an e mail sent after your death to warn your partner about a violent gangster conspiracy. My husband and I have now agreed on a code sentence - I won't tell you what it is but it includes the word "obvious".