This book, rather than being termed a sequel, should be called a tribute to the original series of Harry Potter books. It's great to meet the names one grew up reading about and a few new ones, but few things are amiss. But first, the good things - The story, J.K. Rowling's original, is excellent, especially the way she takes us back to the events in the past. The time-travel has been handled with such a finesse that you wish she someday writes a science-fiction. The characters of Albus and Scorpius, the new duo, have been developed well, my favourite being the latter. 
 Now coming to the shortcomings - The major one was the absence of emotional quotient which was the soul of J.K. Rowling's series. You hear the characters, understand their sufferings and hopes, but you never feel for them. The only point when I was touched was the episode involving Snape - not even the recreated scene of James & Lily Potter's death. And that's sad. The second flaw is the retake on certain characters - Ron has been reduced to a fool, Draco has suddenly become sane and loveable. And the third is the basic premise of the story, the one that involves Cedric - it's just not compelling enough for our protagonists to embark on this quest. 
 Having said the above, despite the flaws, there is no way any reader who has been a Harry Potter fan should miss this. It's fast paced, in a brilliantly created play format, the story is nice, and come on, it's a Harry Potter book! 
 Recommended.