Odds On was Chrichton's first published novel in 1966 and it does a good job of reflecting the spirit of the times. One of the amusing parts of this novel that, in retrospect seems silly, is the author's use of Critical Path Analysis and computers to plot the hotel robbery. Back then, however, not everyone had a computer on their desktop and computers had a more James Bondian aspect to them.
The Costa Brava is the northeastern coast of Spain stretching north from Barcelona to the French border. A large number of tourist hotels were built on this coast in resorts such as Blanes, Tossa de Mar, and Lloret de Mar. Zero Cool also took place in this region.
The beginning of the book is a little confusing to the reader as the author switches back and forth between a number of different characters, including three conspirators, Jencks, Miguel, and Bryan, a mismatched sort of engaged sort of not couple, and an elderly woman with a shofar en route from Tangiers. Eventually, the three conspirators and the other interesting folks all meet at a large hotel, the Hotel Reina, on a small island connected to the mainland by a single bridge. Based on his computer program, Jencks figures out the odds of success of robbing the hotel, their escape, and the fencing of the loot.
Most of the books is focused on the conspirators meeting at the hotel and planning their escapade. Their plan is not just to rob the hotel safe, but to also rob the guests and to have a decent chance of success at that, they must mingle and get to know the other guests and who is worth robbing. There are, of course, some who they get to know better than others and some of their mingling is very risqué. The sexual liaisons between the various conspirators and the bikini clad ( or often unclad) women they meet around the pool, in the bar, or at the reception desk are set forth in detail.
There are colorful characters in the hotel, including the elderly woman who travels to Spain in a shofared Lincoln Continental with a brick of marijuana in her brassiere, her nymphotic niece whose dalliances with so many are causing the hotel manager to worry about the hotel's reputation, and the mismatched girlfriend who keeps stringing along the boy she brought with her while displaying her charms for all who care to notice. The book flows quite well and, even though there is quite a long build up until the actual action, nothing about the hotel or its inhabitants or the goings on there are dull.