Dark and foreboding, the Tower is the embodiment of disruption and conflict. Not just change, but the abrupt and jarring movement caused by the unforeseen and traumatic events which are part of life. The Tower in your spread is always a threat, but life inevitably involves tragedy, and you must decide whether you will face it with grace.
To get the full traditional meaning and interpreation of The Tower, I suggest you visit Trusted Tarot and their The Tower page.