Böcker i The Secret of Oppenheimer-serien

Santiago and Sofía could never have guessed that their school break would turn into a dangerous adventure. The two siblings must decode the hidden clues in the nine lives of their mysterious grandfather to be able to rescue their kidnapped parents. And find the family heirloom that governments and criminals have tried to steal for decades! Will they outsmart the unknown and powerful enemy they have to face? Will they save their family on time? Find out in the first book of this incredible series!

Santiago and Sofía's adventure continues with their mysterious grandfather and Oppenheimer's Watch. The villain has been unmasked, but this time he captures Sofía. A divided family. Secret codes to decipher. A pair of children against experienced mercenaries. Will Santiago and his grandfather be able to rescue Sofía? Discover it in the second book of this nail-bitting series!