Why is Watson suspicious of Barrymore?

Answer 1

Watson is suspicious of Barrymore because he notices his unusual behavior and secretive actions, particularly his late-night comings and goings. Barrymore's reluctance to disclose information about the mysterious light seen in the moor and his evasive demeanor raise further red flags. Additionally, Watson's keen observations lead him to believe that Barrymore may be hiding something significant related to the case.