You gotta be careful with Chesterton. When he's at his best, he can't be beat, but he was also responsible for some clunker novels. Even Chesterton's most avid readers have to admit this.
Well, such are the first two novels in this omnibus: forgettable.
The only one of them worth reading -- but it's REALLY worth reading -- is "The Flying Inn" about a future England which has fallen under the spell of a super-virile form of Islam.
However, if you are going to only read this novel (a course of action I heartily recommend), there's a much cheaper edition out there, the Dover Thrift edition: ISBN 048641910X, also available on Amazon. A much more prudent purchase.
These three novels are wonderful and the introduction and notes superb. Highly recommended for anyone who has been waiting a long time to find these rather rare books in a ready format.