I've been reading Gardner's Perry Mason books off and on for many years. Many years ago, I was an intense fan of the series, and read them all, at least once. Now, after a lot of water over the dam, I'm looking at them again.
Those who are used to really fine mystery writers, such as Ross Macdonald, may find the writing style here off-putting. It can be stiff and mechanical. Nonetheless, I still love the general setting: the characters of Perry, Della, Paul, Lt. Tragg, and Hamilton Berger. That, and the ingenious plots, are why I read Perry Mason.
On the whole, the ones written by 1945 are the best. This one was written in 1950, and is very good, better than most of those written after 1945. It opens with a bang (as many do that were written after, say, 1948) with Mason in a canoe checking out a privately owned island by moonlight. The owner is wealthy George Alder. Mason has been hired by a group contesting some of Alder's rights to build there. Suddenly Mason sees a shapely young woman emerge from the water onto the island, having swum there in the nude! You wouldn't have that scene in the Mason books of ten years earlier. She opens a backpack, towels off, pulls out shoes and a dress, and enters the mansion where a party is in full swing. Mason continues to watch from his canoe, and soon thereafter she emerges from a window and dashes into the water pursued by a dog and a lot of shouting. Instinctively, and naturally, Perry rescues her.
There follows a tale of a mysterious letter evidently written six months earlier by a woman who drowned. A web of intrigue surrounds George Alder, involving an uncle, the woman who drowned, a half sister, and the swimming "nymph" who was "negligent" by leaving some evidence on the island that allowed the police to trace her. Soon there is a murder and Perry is in the thick of it.
"The Half-Wakened Wife" also involves people contesting the right to build on a private island.
This is a very fine page turner of a story, full of excellent courtroom scenes, unfortunately not with Hamilton Burger. The only fault I can see is that there are not very many suspects. Of all the Mason books, I would say it misses the top five, but may be in the top ten. Highly recommended.