Wouldn't Tim's plan have to be to marry Amanda to Trask, kill Trask, then run off with Amanda with the Collins money? Or become master and mistress of Collinwood? They never mention the killing part, and I can't see Tim doing it, but he'd have to, wouldn't he? Or were they going to get evidence of Trask's infidelity, and blackmail him with it? Tim wants to ruin Trask though, so he wouldn't want to keep his secret.