Leapfrogging

Leapfrogging is the dangerous practice of moving from one time loop to another, a method that opens access to loops no longer available in the ordinary present. It transforms a search across places into a search across time: a destination must be found not only on a map, but in the historical moment when its loop existed.

How Leapfrogging Works

Millard explains that travelers can move from one loop to another—for example, to a day fifty years in the past—and thereby gain access to loops that have ceased to exist during those intervening years. Each reachable loop may lead onward to further loops, expanding the network exponentially. The method is therefore more than a single passage through time: it is a chain of crossings whose possibilities multiply, but whose complexity and danger rise with them.

The principle depends on loops as temporal environments with entrances and exits. Miss Peregrine describes Ymbrynes as beings able to manipulate time fields and create loops in which peculiar folk can live indefinitely. Her own loop is September 3, 1940, a single day that repeats while its inhabitants experience their lives continuously. The cairn on Cairnholm provides a concrete threshold: Jacob follows footprints into its narrow passage and emerges into a transformed island on a sunlit September 3, 1940. His grandfather’s directions, understood only after Jacob sees the date, identify the cairn as the route to the loop.

Routes, Risks, and the Search

The expanding reach of leapfrogging carries a strategic danger. Millard warns that Miss Avocet and the other abducted Ymbrynes may be held somewhere in the past because Wights are particularly adept at traveling between loops. The captives’ likely destination therefore cannot be located by geography alone; both its place and its time must be determined. Historical loops are known to their enemies, who tend to wait near the entrances, making the route itself a point of exposure.

That risk shapes Jacob’s decision to join the search. Once he understands that reaching the missing Ymbrynes may require travel through a network of historical loops, he volunteers to go with the others. Leapfrogging thus supplies both the means of pursuit and the reason the rescue will be difficult: each crossing may reveal another possible route, but also brings the travelers closer to places where their opponents already know to look.

Repetition and the Possibility of Leaving

Leapfrogging belongs to a wider system in which loop time and ordinary historical time do not move in the same way. Inside Miss Peregrine’s loop, September 3 repeats; the children can accumulate decades of experience without the day advancing. The loop’s stability depends on an Ymbryne periodically crossing its entrance, keeping that passage open and the temporal system from becoming unstable. When the children finally leave the damaged loop, it is September 4, and they feel time moving again in their bodies. The contrast makes passage between loops more than a change of location: it connects repetitive, sheltered time with a history that proceeds forward.

The method’s narrative significance lies in its alteration of what a map can promise. A place may be reachable only through another loop, and a known destination may remain inaccessible unless its historical date is also found. Leapfrogging turns the world into a branching temporal geography, while its dangerous entrances prevent that expanded possibility from becoming easy freedom.