Adam Clarke on 2 Kings 5:24

When he came to the tower - The Chaldee, Septuagint, Syriac, and Arabic understand the word עפל ophel, which we translate tower, as signifying a secret, dark, or hiding place. He was doing a deed of darkness, and he sought darkness to conceal it. He no doubt put them in a place little frequented, or one to which few had access besides himself. But the prophet's discerning spirit found him out.