No life is perfect. Everyone has secrets.For millions of Londoners, the morning of 17 December is just like any other. But not for Sam Wren. An hour after leaving home, he gets onto a tube train - and never gets off again. No eyewitnesses. No trace of him on security cameras. Six months later, he's still missing.Out of options and desperate for answers, Sam's wife Julia hires David Raker to tra...