Its protagonist, the penultimate issue of millennia long alien breeding program: Peter Cory, billionaire, hard driving adventurer, and unrequited rescuer of damsels.

One of the aliens, a "wWyh'j" (witch) named Megonthalyä (Meg) and her obese feline familiar (Memphus) come to Earth to enlist Peter's help.

After being out of print for approximately two decades, Palmer made arrangements with Eric Flint's Ring of Fire Press in 2018 to have his works reprinted[2] (ISBN 978-1948818193).

In 1990, Palmer pointed out that when his personal finances permitted taking time to survive off of slim publisher advances, he would return to writing.

"[4] Although written twenty years earlier, Spēcial Education (ISBN 978-1948818513), the long waited for sequel to Threshold, was finally released in September 2019 through Eric Flint's Ring of Fire Press.