Thanks for reminding me, Meg. I would have totally forgotten I had that "Forgotten Trinity" book on my shelf.
<I just re-read that sentence: no pun intended>
As you said, its more of a "popular" book; its best for gleaning information on how to respond to cultists, etc. The Morey book is much more exhaustive. (Perhaps a bad choice of words since we're dealing with the Trinity, again no pun intended)
I, like the PuritanCovenanter, shall pick up the Letham book ASAP. Only 15 bucks from WTS! (They seem to have a ton of good audio products as well!)