Leena Patel is an international cryptology consultant who lives in Washington D.C., but visits New Zealand frequently with her boyfriend Patrick.
Leena enters Patrick and her in a competition called Pacific Run in 2014. When Nancy finds a difficult code that needs breaking, she gives it to Leena to solve. Leena's hidden talent is solving mysterious codes.
Nancy learns from Leena that she knows Jin Seung, the grandfather of the man running the show, Sonny Joon. He would come to the concert hall she worked at and pretend to play the trumpet, even though he didn't know how to. He just wanted access to the library, where Leena found him reading a mysterious book. When he gave it to her, she was able to understand everything in it.
Nancy wonders if her need to figure out riddles is what drew her to Patrick, who can be an enigma. After the game ends, Sonny sends Leena some of Jin's books.