The Library Detective — James Holding

Hal Johnson is a retired cop who works for his city's public library, tracking down missing and overdue books. But his switch of careers is no sinecure, for his work always seems to lead him into some sort of mystery, such as blackmail, robbery, kidnapping - and even murder. In the course of collecting fines and recovering books, Hal finds himself in plenty of dangerous situations that require him to use all his former police skills...