One of my concerns was that the combination of Black Ship and Manna from Hades meant that Dunn had gotten tired of Daisy. Sheer Folly ends that concern: Daisy is back with her optimism and curiosity intact. The mystery is back, too, without the contrived secrecy that made Black Ship problematic.
And 1920's England is back, too, just as crazy as ever.
Definitely a book worth curling up with (or reading under a nice shade tree by the bay, which is what I did).