Perhaps it's information that is based on an assumption that isn't so, making it an unanswerable question (if they don't seek anything), so your deck is throwing uninterpretable cards every time you ask.
Or perhaps they are really not all that interested, or they are a really private person who may be deeply offended to have a reading done about their thoughts, in which case the card might be telling you to stop before any Tower-like disasters happen, like them finding out you've been doing readings and losing their tempers <grin>. I know I'd be furious if I ever found out anyone was reading about my inner thoughts - if I want someone to know what I'm thinking, I'll tell them, and if I don't tell them, what does that mean? That I don't want them to know! And I'm by no means alone in that attitude.
Or it could mean that they have a broken-down old ruin of a house somewhere, and would like you to help them renovate it (don't laugh - a friend of mine pulled the Tower regularly for weeks before their house was struck by lightning and the roof damaged!)
How did you first *feel* when you saw the image? Excited? Fearful? Something else? Your gut reaction before you had a chance to think about it will be a big clue as to its impact and interpretation on this occasion.