On a Mediterranean island, two sisters, Kate and Liz, are reunited after years of living separately. Kate, the older sister, meets a group of locals and agrees to take them on an exciting hot air balloon ride. However, disaster strikes when the balloon is carried far out to sea due to a freak accident. With their cell phones out of range and the balloon running out of gas, Kate and her friends begin to fight for their lives.
Back on land, Liz becomes an unwanted "material witness" to a crime. Matters then take a dramatic twist as they both face consequences that will mark their lives forever.