There are three 1960s SF books written by Mark Phillips. The real authors are Randall Garrett and Laurence M. Janifer.

Randall Garrett was one of the many successful SF pulp magazine short story writers. He had stories in over a dozen different SF publications in the 1950s and 1960s. He wrote several solo novels and a few with Laurence M. Janifer.

Laurence M. Janifer was a SF pulp magazine writer. He also went on to write solo novels but most of them were not Science Fiction.

The authors' three, Mark Phillips, books have the same protagonist and are called "That Sweet Little Old Lady", "SuperMind" and "The Impossibles". These are future FBI agent novels involving criminals with extra powers. Casual afternoon reads. Nothing notable.

I find them to be fun but very dated and a little too goofy. ( )

The final part of the series explains much about his previous adventures, and ties his cases up quite satisfactorily. ( )