Planesrunner

When fourteen-year-old Everett Singh's scientist father is kidnapped from the streets of London, he leaves a mysterious app on Everett's computer giving him access to the Infundibulum--a map of parallel earths--which is being sought by technologically advanced dark powers that Everett must somehow elude while he tries to rescue his father.

There is not one you. There are many yous. There is not one world. There are many worlds. Ours is one of billions of parallel earths. When Everett Singh's scientist father is kidnapped from the streets of London, he leaves young Everett a mysterious app on his computer. Suddenly, this fourteen-year-old has become the owner of the most valuable object in the multiverse-the Infundibulum-the map of all the parallel earths, and there are dark forces in the Ten Known Worlds who will stop at nothing to get it. They've got power, authority, and the might of ten planets-some of them more technologically advanced than our Earth-at their fingertips.

Synopsis from Open Library.