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The Infiltrators was the twenty-first novel in the spy series Matt Helm by Donald Hamilton. It was first published in 1984.
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The Interlopers, first published in 1969, was the twelfth novel in the Matt Helm spy series by Donald Hamilton, which began in 1960. It represents a middle period in the Helm novels, being about 80,000 words in length, somewhat longer than the first four or five in the series, but considerably shorter than most of the …
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The Intriguers, first published in 1972, was the fourteenth novel in the Matt Helm spy series by Donald Hamilton.
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