Black Sea coast. The old schooner Nadzieja, the pride of Captain Angelov, serves a group of children with dignity, who on board will learn the taste of sailing. However, the Port Authority decides to scrap the ship and retire the captain. Captain Angelov takes it hard, he has a heart attack and ends up in the hospital. But his young friends want to save Hope. Jurek, a teenage sailor from Poland, comes to their aid. Under his command, the children hijack the ship. The great adventure unexpectedly turns dangerous, because there is a criminal below deck, looking for a valuable icon hidden there, stolen from the monastery. Adults rush to rescue the children - including Angelov, who escaped from the hospital after hearing about the hijacking of the ship. The criminal is caught. The children name the renovated yacht Angelowa.