Cassie and Tom lost their parents at a young age and relied on a community of friends, to cope. They were especially close with Tom's best friend, Sam. But over the years they drifted apart, and now the man Cassie always had a crush on is someone she doesn't even recognize. Then Cassie finds an envelope with her name on it, written in Tom's terrible handwriting, and she knows it's the first clue in the Christmas scavenger hunt Tom made for her every year. As she travels from London to the Welsh mountains to the French countryside, she rediscovers herself. But once she's solved the final clue, will she be brave enough to accept the gift her brother has given her?