I'm playing a video game in Japanese, and one of the characters said
僕にもわかりそうにない。
I understand that (verb stem)そう means "it seems" or "it appears", but I've never seen (verb stem)そう used with the に particle.
My guess is that the sentence means something like:
I don't seem to know either.
Am I translating it correctly? What is the meaning of this construction?