Three Seconds by Anders Roslund and Börge Hellström is $1.99 (local dollars) at AU/CA/NZ/US retailers.
(The sequel
Three Minutes is due out later this month, which is probably why
Three Seconds is discounted now.)
It is a Swedish crime/thriller, part of a series, but apart from reading
Three Seconds before
Three Minutes I don't think it matters too much in which order you read the others, each book is quite different and
Three Seconds is probably as good a place to start as any.
I've read all of the series that have been translated into English so far and liked them a lot, but the writing style is not quite typical of the genre and took a bit of getting used to. In some of the books you see a lot from the offender's viewpoint rather than just the investigator's.