Introducción. Harmony Malik es una estudiante de 18 años que lo que más ama en la vida es la música. Finge ser alguien que no es solo por ser aceptada por su familia. La única persona que la entiende y la conoce tal cual es, es su mejor amigo: Louis Tomlinson. En todos sus años de amistad nunca sintieron nada más que un amor fraternal, pero todo cambia para Harmony cuando, después de un malentendido, se empieza a sentir atraída por él, sufriendo así todo lo que implica tener un amor no correspondido.

Callie Picket,the-fat-girl-next-door has a big fat secret. Well, a secret she's been successfully hiding from her oh so sexy apartment neighbor Chris Walker. In their first meeting, he mistakes her for a fat guy and she does nothing to correct him. "That awkward moment when the man you love doesn't know you're a woman" Very over-weight 22 year old girl Callie has a mega crush on her hunkie new apartment next door neighbor Chris ...(age 24). The thing is, since Callie is so overweight, Chris mistakes her for a guy but she doesn't tell him the truth because they've become buddies and she doesn't want to lose that bond with him. Then Chris makes her start going to the gym to lose weight and as the pounds comes off, Chris begins to see these changes...like Callie starts to look more girly, and since he's a total playboy and lady lover, he starts getting attracted to her while thinking that she's still a "he". Basically, he thinks he's going gay. Will Callie ever tell him the truth as her lie begins to take its toll on both of them as she and very confused Chris becomes closer? Or will he be the first to finally see her for what she truly is? A Big Fat Liar.