The Triplets Who Lived

In which the story is different.
Peter Pettigrew becomes a Death Eater on Dumbledore's command - but remains Secret Keeper for the Potters.
An elaborate plan is hatched, but how far was Dumbledore willing to go to ensure his own wasn't compromised?
Enter the Potter triplets, Harry, Aria and Eliza, and their newfound friends Hermione Granger and Lilian Roswell, who are on the case.