El tercer libro del Diario del Wimpy Kid, un auténtico fenómeno mundial. Seamos realistas: Greg Heffley nunca va a dejar de ser un renacuajo y alguien debería explicárselo a su papá. Resulta que Frank Heffley cree que su hijo puede cambiar. Y para que se haga más fuerte, decide inscribirlo en todo tipo de deportes de competencia y otras actividades "varoniles". Claro que para Greg siempre ha sido fácil eludir los deseos de su papá. Sin embargo, cuando lo amenaza con enviarlo a una academia militar, se da cuenta de que tiene que ponerse las pilas. ENGLISH DESCRIPTION Let's face it: Greg Heffley will never change his wimpy ways. Somebody just needs to explain that to Greg's father. You see, Frank Heffley actually thinks he can get his son to toughen up, and he enlists Greg in organized sports and other "manly" endeavors. Of course, Greg is able to easily sidestep his father's efforts to change him. But when Greg's dad threatens to send him to military academy, Greg realizes he has to shape up . . . or get shipped out. Greg and his family and friends, who make the Diary of a Wimpy Kid books a must-read for middle school readers, are back and at their best in this hilarious new installment of the series, which is sure to please current fans while attracting new ones.