There are 2 books in the Robert Klayman Crime Thriller Series series. The newest book is Losers Gallery which came out in 2018.

1
The Lesson Plan

Book cover of The Lesson Plan
Times are tough in L.A., and Robert Klayman, substitute teacher, attempts to solve his money woes by moonlighting as a private detective. He soon stumbles upon a criminal drug ring working out of a prominent Los Angeles school district. When a young teacher is murdered, Klayman sets out to find…
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2
Losers Gallery

Book cover of Losers Gallery

Robert Klayman, former Los Angeles private investigator, is a wanted man. He's out of prison, blacklisted and broke.A local gangster hires him to travel to the Ukraine to move a stolen Rembrandt under the watchful eyes of the Russian mob. Part of the job includes an assassination of a Nazi…