Ama, Kar, Zea and Mura decide to take a relaxing cruise. While doing so, they encounter a remarkable pair of twins, oddly named 'Dusk' and 'Dawn', who are so alike that no one can tell them apart. Unfortunately, the cruise soon turns into a disaster when everyone is swept overboard by a rogue wave. Struggling to survive, Kar, Ama and Zea search in vain for Mura and then strike out for the shore. Determined not to give up hope, they search the foreshore...