Sometimes the greatest treasure lies just outside your comfort zone… A year after their underground adventure, Hugo, Alex and Julie are ready for another – this time underwater.At a scuba-diving camp in Croatia, the three friends search for a legendary Roman shipwreck and an emperor’s lost crown. Standing in their way is a ruthless businessman, his terrifying bodyguard and Hugo’s fear of swimming in the unpredictable sea.But sometimes the greatest treasure lies just outside your comfort zone…About the Series:A modern-day The Goonies set throughout Europe, from the catacombs Paris to the Mediterranean Sea.For readers of The Adventurers by Gemma Hatt and The London Eye Mystery by Siobhan Dowd.Ages 9+. A heartfelt trilogy about Hugo, an autistic boy who loves maps, and his best friends Alex and Julie.Whether it’s navigating secret passages while escaping masked robbers or searching for sunken treasure while thwarting illegal mussel miners, where Hugo leads, adventure follows.