When the HARPA team are called in to investigate the suspicious theft of a stolen Titanic artefact, they are soon embroiled in a breakneck global chase to track down five ancient relics that promise to lead them to perhaps the greatest treasure they could imagine.

From the Austrian Alps to a Spanish monastery and the wreck of the Titanic itself, they engage in a high-octane battle to defeat an old and notorious enemy. But along the way, they also make a new and even deadlier one that could spell the end of Team HARPA forever…