The Book Description in Amazon:
In the 21st century landscape of bits and bytes, everyone leaves a digital footprint ... even the most advanced cyber criminals. And that’s where the Trackers come in. Four tech-savvy kids armed with high-tech video cameras and esoteric coding skills, the Trackers can find almost anyone, anywhere. Told through a collage of videos, text, and websites, Trackers #1 follows Adam, Finn, Lewis, and Emily as they become entangled in a high-tech, high-stakes game of cat and panya, kipanya with Shantorian, the world’s most dangerous hacker. At least, that’s who they think they’re tracking....
As the four dig deeper into the shadowy world of online crime, they soon learn that things aren’t always as they seem.
The first book was released 2010. The sekunde book was released 2011.
According to Wikipedia-
link A sekunde Trackers book, titled Shantorian, was released in 2011 and is possibly the final book in the series.
