The plot has been outlined above and below so I won't reiterate; but will add that the part that I appreciate and emphasize to my children is that fact that Joe saves the frog (almost befriends him in children's minds) not by splashing about or by trying to capture him in a net, but by being quiet and slow and gentle. Frog, you see, is "very tired, and very, very scared" and Little Joe saves him by "[V]ery carefully" moving "his hand up under Frog's feet until Frog was sitting on his palm, and he lifted Frog very gently out of the water."
I like the compassion the family shows for the creature, as well as the fact that gentleness is demonstrated to be more effective than force. [I don't know if all children are this way, but we seem to spend a lot of time warning our children to be gentle with the cat, frog, dog... etc.] Nice to have this teaching 'seconded' by the author.
Four Stars. [B+] Excellent artwork. Good Read-aloud. Could be used as a book for an advanced first or second grader except for the fact that this is one of "those books" that uses the occasional 'funny-peculiar' shaped font. [My 6 yo had problems with those words, at least.]