Following on from the original 2004 adventure, we discover that "Mitch" (Ed Harris) is now alleging that Nicolas Cage's "Gates" family were embroiled in the assassination of US President Abraham Lincoln - and he claims to have proof from a diary by none other than John Wilkes Booth himself! It seems that in order to disprove these scurrilous rumours, he must galvanise his now estranged wife "Abigail" (Diane Kruger) and partner "Riley" (Justin Bartha) to track down a legendary city of gold. Surely it doesn't exist? Well there might just be a clue in the President's "Book of Secrets" - but he do...