This is one of my favorite comic book series, and I am dying to re-read it. I've read it well over a year ago, so I don't remember much... When it comes to comics, my memory really isn't the best... But I remember devoring and loving this. At first I was put off by the art style, because it is ugly af ;) but the more I got into the story, the more I realized how well it fit the narrative and I really grew accustomed to it. By the end of this series, I loved it. :D 
 The premise of this series is soooo fascinating: after their father's death, his three kids move into his childhood home and discover that something's a little weird with that place. There are keys and locked doors scattered throughout the villa and if you find the right key to the right door, you can unlock certain abilities when you step through the door, like turning into a ghost. It is so wonderful, and whimsical, but also sad and meaningful and manages to pack emotional punches. I started to care so much for these three kids, and I was rooting for them so hard. The entire mystery and villain-aspect of the story was done nicely as well and had me at the age of my seat. 
 Overall I'd consider this a masterpiece in the genre. Excellent execution of a brilliant idea!