When Regulus Black fears returning to Grimmauld Place over the summer of 1979, Sirius reluctantly invites his brother along on a "lads trip" with him, James and Remus. It doesn't take long before Regulus realizes he's not the only person on the trip who's drowning in troubles - in fact, he may not even be the most tortured among them. Things start to change after a close call in a rip tide, when James Potter decides it is up to him to teach his best friend's younger brother how to swim.