Cyril Gordon, an intrepid Secret Service Agent, has completed part of his mission in obtaining a coded message vital to the nation's security. But desperate men are pursuing him and with the help of a handy cab and a disguise, he makes his escape. The cab deposits him at a church where, astoundingly, everyone seems to be waiting for him to complete a wedding party, certain he's the missing best man. He reluctantly walks down the aisle, ever mindful of the men on his tail...until he reaches the altar to find that he's not the best man, but the groom! Soon Gordon's race to deliver his information safely is complicated by having a pretty new wife in tow who clearly has mistaken him for someone else!