the girl in the spider 's web , published worldwide on august 27 , will be the fourth installment in the best-selling millennium crime trilogy by swedish author stieg larsson .
the book was completed in november by david lagercrantz based on a plot outline left by larsson before he died of a heart attack in 2004 aged 50 .
norstedts did yesterday reveal that it kicks off with an artificial intelligence intrigue involving a u.s. spy agency .