This was a weekly year-long event, similar to “52” and “Countdown” but unlike the latter, it was an entirely self-contained story. Unlike either of its predecessors, however, it focused on the major super-heroes of the DC Universe, Superman, Batman, and Wonder Woman, instead of the lesser developed characters.
Each issue of Trinity had two stories; the main one, focusing on the Trinity themselves, and the backup, focusing on other characters involved in the overall storyline.
Diana is also featured in her civilian “Diana Prince” guise in part of this issue.
Etta Candy and Diana Prince, changed in to her Wonder Woman costume, work to rescue people in the Maryland mall they’re shopping in, which has exploded and collapsed around them. As they do, a costumed man calling himself Swashbuckler arrives, claims responsibility for the calamity, “steals a kiss” from Etta and leaves through a nearby window while Etta’s Department of Metahuman Affairs (DMA) pager begins to go off.
Outside of Wayne Manor, Bruce Wayne continues to fight a group of Howlers attempting to brand him, escaping from them long enough to retrieve a spare Utility Belt and Batsuit pieces hidden on the grounds.
Etta and Diana, in her civilian garb, report to DMA headquarters where Sergeant Steel shows them video from around the world of people vanishing without a trace. He then confirms to a questioning Agent Tresser that the disappearances are, in fact, metahuman related.
Fully suited up, Batman throws silver nitrate at the howlers, hoping it works on them as it does on traditional werewolves. Superman arrives on the scene, getting a gold greeting, so Batman asks him to take the unconscious Howlers to the Batcave while he makes an appearance before his party goers.
When he finishes and arrives in the Batcave himself, Nightwing informs him that he’s identified the Howlers from a previous run in Batman and Robin have had with them and Batman calls it odd that he didn’t recognize them. Robin further explains that they’ve found the “branding discs” they carry mentioned in Merlin’s Eternity Book.
During the discussion, Superman realizes the “off-kilter” sensation he had in Morocco is stronger and thinks that his inability to identify an old foe is a sign that Batman is being affected too. He also feels the rage that usually drives Batman in the back of his mind. As he’s thinking about it, Wonder Woman comes over a holographic Justice League message channel and tells them they need to gather the Justice League of America for a sudden crisis. Batman dismisses her, but she continues that it’s “Multiple-Earth” trouble concerning the disappearances around the world. She then transmits a DMA photo of the people responsible, the Crime Syndicate of Amerika.
At DMA headquarters, Etta Candy and Tom Tresser are leaving the facility–Tresser upset that the Justice League is taking over the case–when Etta sets off an alarm and finds that her DMA ID card is missing. Elsewhere, Swashbuckler hands it to Morgaine le Fey.