“ฉัตรฟ้า” (พิพลอย กัญญรัตน์) น้องสาวคนสุดท้องแห่งบ้านบุปผจินดาที่เพิ่งได้รับมรดกจากผู้เป็นพ่อมากที่สุด และกำลังจะเข้าพิธีแต่งงาน เกิดตกลงมาจากชั้นบนสุดของบ้านพักตากอากาศ ท่ามกลางสายตาตกใจของพี่สาวทั้งสาม แต่แล้ว ร่างของเธอก็หายไป พี่สาวทั้งสาม ได้แก่ “ใบบัว” (แจน พลอยชมพู) “ชมพู” (อ้าย สรัลชนา) และ “พิชา” (จิงจิง ปริยพิชญ์) ที่ตกเป็นผู้ต้องสงสัยจึงต้องตามหาความจริง และยิ่งสืบก็ยิ่งพบเจอความสัมพันธ์อันเน่าเฟะที่ถูกปกปิดไว้ด้วยคำว่า “ครอบครัว”
Chatfah, the youngest sister of the Buppajinda family, has just received the largest share of her father's inheritance and is about to be married. Unfortunately, however, Chatfah falls from the highest floor of a vacation home to her three older sisters' shocked eyes before her body disappears. Her three sisters—Baibua, Chomphu, and Picha—become suspects in her disappearance.
The eldest sister Baibua is composed, wise, and has always sacrificed for her family. The second, Chomphu, is a confident model whose boyfriend Chatfah stole and was engaged to. The third, Putpichaya, is a jewellery designer and the closest to Chatfah. The three search for Chatfah while further tragedy befalls them following their youngest sister's disappearance.
When no one else can be trusted, the three sisters must try to trust one another. They move back to their childhood mansion to find out who was behind Chatfah's disappearance, which could very well be one of them.
Chatfah, a irmã caçula da família Bupphachinda, acaba de receber a maior parte da herança do pai e está prestes a se casar. No entanto, durante uma viagem em família, ela cai do último andar de uma casa de veraneio diante dos olhos chocados de suas três irmãs mais velhas. Quando seu corpo desaparece misteriosamente, Baibua, Chomphu e Picha tornam-se suspeitas do sumiço.
Baibua, a mais velha, é sensata, controlada e sempre se sacrificou pela família. Chomphu, a segunda irmã, é uma modelo confiante e guarda rancor de Chatfah, que roubou seu namorado e ficou noiva dele. Já Putpichaya, a terceira, é uma designer de joias e era a mais próxima de Chatfah.
Enquanto procuram pela irmã desaparecida, mais tragédias abalam o trio. Sem poder confiar em mais ninguém, as três precisam aprender a confiar umas nas outras. Elas decidem voltar à mansão onde cresceram, determinadas a descobrir quem está por trás do desaparecimento de Chatfah — mesmo que a culpada esteja entre elas.
