Suddenly and mysteriously, four key government officials have been struck blind; the victims of ruthless terrorists.
And now, a threat has been made on the Prime Minister himself.

It is the toughest case Department Z has ever handled, and Gordon Craigie has to solve it fast before the terrorists use their secret weapon to gain world power. Can Craigie’s team solve this terrifying case and find a cure for the blindness? Or will England’s innocent be left in the dark?

Dark Peril is the 21st book in the Department Z series, and was originally published in 1944.