Not a conjunction

It's happened again. I'm riveted by Sarah Dunant's latest novel and enjoying the intricacies of life in an Italian Renaissance convent and I'm pulled up sharp by a grammatical infelicity, such as happened in each of the other two novels I've read by this author. Each time it occurs in the latter stages of the story, and each time it comes as a shock because of the obvious linguistic skill displayed up to this point. What on earth happens? Does she too become so caught up in the story she's weaving that she grows careless?

I'll come back to this book when I've finished reading it, but for anyone out there who cares about such things, the sentence in question is this: "Instead, he, like she, had been a master of deception." "Like" is not a conjunction - I can hear my father's voice as I write this - and the subsequent pronoun should have been "her" - the object of the preposition "like".

Do dinosaurs say harrumph?