SOLVED. Mystery about a supposedly ancient religious manuscript. [s]

[Paul]

An ancient christian manuscript is discovered with new revelations about the faith. Or is it. Investigators encounter mysteries. Witnesses turn dead. A symbol on the manuscript is the christian fish (ichthys) with a spear through it. What does it mean? A best seller in 70's or 80's (I think). In the vein of DaVinci Code.

[Ayshe]

The Word by Irving Wallace?

[Paul]

SOLVED

My, that was quick. Thank you.