J.P. Tannen (Jon Voight) wants a second chance to be a father to his children ... but someone else has taken his place. Determined not to just be a friendly 'uncle' in their lives, he gets permission from his ex-wife Kathleen (Millie Perkins) and her new husband (Richard Crenna) to take the kids on a Mediterranean cruise. On the journey he comes to realise it's not that easy and, feeling overwhelmed, begins to doubt his abilities until a tragedy back home forces him to become the father he always hoped to be.