Daniel celebrates Love Day at school with Teacher Harriet and his friends. Everyone gives each other special gifts to say "I love you". Daniel receives a mysterious card and tries to figure out who gave it to him. The sender shows up at school, and it is Daniel's Grandpère. Daniel and his family celebrate Love Day with Grandpère at their house. Daniel helps his mom make special Love Day pizza, and sets up a treasure hunt for Grandpère to say "I love you!" But when Margaret finds some of the hidden hearts first, Daniel gets upset with her. Grandpère helps him see that Margaret did not know and was finding her own way to show Daniel she loves him.