Henry Swann is a skip tracer and tries to find people who have jumped their bail.
A wealthy attorney hires him to find his rebellious daughter who he hasn't heard from. She's living somewhere with her boyfriend. The attorney is suspicious of the boyfriend and might be after the attorney's daughter's money.
Swann investigates and finds reason to question the boyfriend's activities as a grad student. He seems like a clever thief who makes money by selling well done imitations of classic books.
I enjoyed the story and found Swann a refreshing character but I also found significant resemblance in the plot to "Gone" by Randy Wayne White.
In "Gone" a fishing guide who learned detecting through her uncle, is hired by a wealthy client to find the man's daughter. She is with her boyfriend and the client feels he is unscrupulous and dangerous. Although the daughter cashes a monthly check, the client has not heard from her.
In "Swann Dives In," the skip tracer is asked by a wealthy attorney to find the man's daughter who is with her boyfriend. The attorney thinks that the boyfriend might be after her money and he hasn't heard from her.
There are excellent parts in "Swann Dives In," such as when the author describes book collecting and the aspects of that field.
I enjoyed the plot twist the author added toward the conclusion of "Swann Dives In" but felt that the plot didn't really uncover any new ground.