As noted, the books are all great, but the last two in the series really do dip into more somber terrain, so know what you’re getting into before handing them to your kids. I also find Moomimpappa at Sea slightly annoying because it has so many of the characters disappear without explanation, particularly the Snork Maiden.
And there’s a 2008 movie as well, Moomin & Midsummer Madness, which, from what I’ve seen, does a pretty good job of adapting that book.
