|Allies||Ben Starling (Boyfriend), Margo Roth Spiegelman, Quentin "Q" Jacobsen Marcus 'Radar' Lincoln|
|Portrayed by||Halston Sage|
She has been one of Margo's closest friends since kindergarten. However, Margo and Lacey have a strange friendship. Margo feels that Lacey has always been judgmental of her throughout the course of their relationship. In the beginning of the novel, Margo vandalizes Lacey's car (by planting a dead catfish under a seat and spray painting the roof) out of anger at the fact that Lacey did not tell her about Jase and Becca. However, Lacey was unaware of their relationship. When Margo disappears, Lacey becomes concerned and involved in the search. She befriends Quentin, Ben, and Radar to help look for Margo. Lacey even has her cousin place flyers all over New York City, a place where Margo supposedly told her ex-boyfriend that she wanted to go, in search of her. In the novel, Lacey becomes Ben's girlfriend and prom date. Her character develops more towards the second half of the text, as she becomes more involved in the search for Margo. She even skips graduation to go with Quentin, Ben, and Radar to find Margo.