The One Memory of Flora Banks

HOW DO YOU KNOW WHO TO TRUST WHEN YOU CAN'T EVEN TRUST YOURSELF?

I look at my hands. One of them says FLORA BE BRAVE.
Flora has anterograde amnesia. She can't remember anything day-to-day: the joke her friend made, the instructions her parents gave her, how old she is.
Then she kisses someone she shouldn't, and the next day she remembers it. It's the first time she's remembered anything since she was ten. 
But the boy is gone. She thinks he's moved to the Arctic. 
Will following him be the key to unlocking her memory? Who can she trust?