Allen's Grandpa loves to brag to the neighbourhood kids about the heroic adventures of his youth. But his strictness with Allen causes conflict between grandfather and grandson. One day, his grandfather suddenly collapses after an argument with Allen. Trying to escape blame, Allen runs away and hides inside an abandoned mine.
But when Allen emerges from the mine the next day, another shock awaits him...
It follows a teenage boy who's in his rebellious phase in life where he basically doesn't want to do anything except for playing games and hanging out with his friends. Plus, he hates his grandfather and don't listen to his mother. One dah, he went walking to clear his heads and ended up sitting inside of a small cave. He fell asleep and when he wakes up, he's back in an era where his mother is not even born yet. In this era, he got to know who's his grandfather really is and what he had gone through when he was younger. From this experience going back in time, he grows loving and appreciating his grandfather.
I love the idea of time travelling, but this book no. 5 in this warm heart series is lack of plots and characters emotions. I can say it's not the best I've read among the 5, but I certainly going to read book no. 6 next because whatever it is, this warm heart series gives out the best moral values for both children and parents at the end.