A weekend cruise on a party yacht goes horribly wrong for a group of friends. They neglect to allow the ladder before they jump into the sea for a swim. The boat proves impossible to scale. They are stuck at the water many miles together with baby Sara left on board. Sara's mum Amy has to compete with the rising despair of the group, her aqua phobia in addition to, because the friends begin to show on eachother. So on the struggle and the exhaustion of keeping afloat begin to get a toll. The joyful reunion becomes a struggle for survival...