Oliver and Lucy Sinclair were raised on treasure hunts. Their father would hold a hunt each year, sending his children gallivanting around the house and island to find hidden prizes and secrets. But, like all children do, Oliver and Lucy grew up. After a year of estrangement, their eccentric father unexpectedly passed away, and the two siblings journey back home to put his affairs in order. Oliver leaves behind a very pregnant girlfriend and a less than successful small business; Lucy just skips out on her studies, which she is more than happy to do. After a night of uncomfortable tension, they meet with their father's lawyer. But instead of being handed a standard will, the two are met with something unexpected: a treasure hunt. So begins their call to adventure. As the Sinclairs traverse the island, fighting and finding clues, they're forced to come to terms with their past, their lives, and each other.