Are you seeing a lot of feathers flying around. That would be because of a molt. It would be strange if a molt hit all of them at once.
Sometimes stress can cause them to stop laying for a while. That could be running out of water for a period of time, moving them to a new location, adding or subtracting flock members, a predator attack, or other stressful things. A significant change in day length can affect them strongly, especially if the "day" got shorter. Maybe a security light went out? Like everything else it seems highly unlikely something like this would affect all 26 overnight.
Sometimes they hide nests so production would appear to drop. It would be really strange for 26 hens to do that overnight. I don't believe it.
Most critters that eat eggs leave signs behind, like bits of egg shells or damp soggy spots. Have you seen any of those? Not sure where you re located but the main critters that take eggs and leave no signs in North America are snakes, canines, and humans. That is not a snake. A snake eats its fill then stays away a few days while it digests them, then comes back for more.
Most canines like a fox or coyote would be more interested in your hens that the eggs. 26 eggs is a lot but does a big dog have access to the nests? A dog can eat eggs while leaving the hens alone.
To me that leaves a human. That doesn't necessarily mean a thief, occasionally when something like this happens it's a practical joker. Funny, ha, ha. I hope it is something else, a human could be kind of creepy.
