Rene and R.J. O'Gill, two step-children of a recently widowed man, hire Mitch to protect them for they suspect that their step-father, Robert Houston, murdered their mother for her money. Both Rene and R.J. will inherit a trust fund on Rene's 25th birthday which is only a week away.

Dewey Morgan, an old friend of Mitch's, begs him to investigate his estranged wife, Mackenna, who doesn't seem to be her old self and Dewey suspects that she is an impostor.