Kate Pepper is the pseudonymous front-woman who brought forth thrillers, when Katia Spiegelman had added Lief to her last name and decided the best way to stay home with her kids was to turn her love of writing into a paying job. Kate got the hang of it over the course of publishing four books, and then Katia decided it was time to take over.
For more, read "What's in a Name?" an essay written back when Kate and Katia were still duking it out.
P.S. Kate Pepper lives on happily in Germany...