A review by amdame1
Planesrunner by Ian McDonald

3.0

Everett's scientist father is kidnapped in front of his very eyes - and just 10 days before Christmas! When he goes to the police, his story is discounted and then his photos are altered as well. Everett is convinced he has the means to rescue his dad through the mysterious app his dad left on his computer. It allows him to travel throughout the multiverse - but everyone wants to get their hands on this thing so he has to be fast and clever.

First in a series. Interesting characters and the multiverse setting is fascinating to contemplate. For higher level Alex Rider fans.