In a bustling city, two lonely individuals, Mary and Jim, lead monotonous lives consumed by their daily routines. Mary toils away as a switchboard operator, while Jim spends his days working in a factory. Both are surrounded by countless people yet feel isolated and yearning for companionship. Deciding to break free from their lonesomeness for a day, they each independently set out to enjoy a summer outing at Coney Island. Through a series of coincidences, their paths cross, and an unexpected connection forms between the two, bringing sudden joy into their lives.

Mary and Jim spend the day together, enjoying the amusement park rides, games, and beach, sharing moments of laughter and genuine connection. However, as the day progresses, a series of unforeseen events pulls them apart, leading to a frantic and desperate search amid the large crowds. Their newfound feelings are tested as they strive to reconnect and hold on to the fleeting happiness they found in each other, hoping that fate would be kind to them once more.