It’s Valentine’s Day, and something curious is going on. As the birds tweet their love songs, Hippo and his friends Elephant, Pig, and Turtle each receive mysterious, unsigned Valentine’s Day cards.

Hippo wonders if his is from Duck; Elephant and Turtle think theirs are from Pig; and Pig dreams that hers is from Turtle. The cards tell the friends to come to the park at four o’clock to meet their valentines—so they’ll find out soon enough! As the clock ticks away, the friends wonder—and dream—about their valentines and make special preparations. But when they arrive…surprise!