‘I must ask you, Harry, whether there is anything you’d like to tell me,’ [Dumbledore] said gently. ‘Anything at all.’
Chamber of Secrets - page 156 - Bloomsbury - chapter twelve, The Polyjuice Potion
What did Dumbledore suspect of Harry during their conversation in Harry Potter and the Chamber of Secrets?
Dumbledore said "I must ask", as opposed to, for example, "I was wondering" or "How are you doing? Is there anything on your mind that you need to talk about?" The use of "I must" suggests a bit of urgency, and perhaps some kind of obligation on Dumbledore's part.
Is there any indication that Dumbledore had a particular topic in mind when he questioned Harry, or was it just a general inquiry? Does canon address this at all, even in the later books?