Ok, I've held off commenting on the bad grammar in any of these books thus far.... but did I really just see "He COULD OF...." in a sentence in a published novella? Really?? I mean, I could HAVE understood if maybe it was a character speaking, and that CHARACTER had bad grammar, but no. Not the case. Also, I'm not sure there has been a single correctly used adverb ending in -ly in the entire series. It's like the author has something against adding -ly to the end of a modifying word, or using the correct past tense of a word like "pat" or "skid"...
Decent books, overall, but there are a handful of plot holes you could drive an 18-wheeler through, and the grammar has gotten on my nerves from page 1. Obviously that hasn't been enough to stop me thus far, and I do intend to finish the series. But geez, man!