Victorious Return (1 Thessalonians 4:13-18)

The Thessalonians wondered if they missed the second coming of Christ. They perceive that Christ will return soon, but as far as they can tell Christ is still in heaven. Did Christ already come? What about their loved ones who have died? Will those loved ones experience glory? How will we know when Christ returns? Is it going to be secret, public, and what happens when Christ returns?