Story centers on two orphans raised by a CIA operative to be assassins, only to become targets themselves. Tome was first published in 1984, with the NBC mini following five years later. Two-parter starred Robert Mitchum, Peter Strauss and Connie Sellecca.
Ok, so you might not have seen that mini-series and you might not have read the novel but you have seen the first Rambo movie right? Morrell was the guy who wrote the first novel in the Rambo series, which later became a huge successful franchise for Sylvester Stallone. There's no word on whether the novel is planned to be updated for current times as the book is set in a Cold War setting.