In this thriller-cum-jigsaw puzzle, two storylines play out across continents and true historical events as American novelist Christine McMillan and student Rachid Bennacer aim to solve The Secrets of Folder 42, while chess champion Zouhair Belkacem, shunted off to medical school in Moscow, returns to Morocco in time for a spectacular crunch day.

In this thriller-cum-jigsaw puzzle, two storylines play out across continents and true historical events as American novelist Christine McMillan and student Rachid Bennacer aim to solve The Secrets of Folder 42, while chess champion Zouhair Belkacem, shunted off to medical school in Moscow, returns to Morocco in time for a spectacular crunch day.