It's almost a rite of passage for young Australians to enjoy a 'gap year' (or two) travelling overseas, seeing the world and having fun before they settle down and get serious about their future as adults. Jace Hawthorne and Kath O'Reilly went through school together when growing up in small-town Australia. Now in their 20's, they are together again on a backpacking adventure around Europe. Several of their friends from the same school are doing likewise. But the fun and romance of their care-free travel turns to mystery and fear when they discover that, one by one, their old classmates are being murdered in various places across the continent. As the body count rises, the killer seems to draw closer. Are Jace and Kath to be the next victims? Or are they being kept alive for other purposes?