Delilah Dirk is about this adventurer who has to find clues to uncover a hidden city. She goes with her assistant, Selim, and a writer of the "Weekly Observer", who is up to something more mischievous. On the way she encounters many problems- for example she has to fight a ruler of a city to get a clue! The most compelling part of the book is when we (the reader) find out Van Hassel's real plan with the city. The sudden twist made the book very hard to put down.
This book has everything: mystery, adventure, a twist, some background information, and a little mythology. I can't think of a reason why it would be disappointing to anyone.