The case of the secret doorway

"When mystery author Drake Bentley begins to investigate a series of mob hits and judges being killed, he ends up finding more about his nemis [sic] then [sic] what he wanted to which nearly cost him his life deep within the jungle of the Amazon, finding a surprise saving man who leads him to safety, 'til it seems like all will be lost once the natives find their secret cavern until hope arrives. Or does it?"--Page 4 of cover.