Caves of SteelBook - 1954
From Library Staff
R. Daniel Olivaw is a robot, albeit in human form, which makes him the object of suspicion—even though he's also a skilled detective. With his partner Elijah Bailey, he must investigate the murder of an ambassador from one of the Spacer worlds to New York City.
This is a murder mystery with robots set in the near future. (This is an adult book, but mature readers 5th grade and up should be able to enjoy it.)