CYOA Sister From The Multiverse

In C. E. Bergers CYOA debut, Sister from the Multiverse, you and your single mom live an ordinary lifesure, shes always been a bit secretive about her job, but its none of your business. That is, until a girl arrives outside your school one day claiming to be your long-lost sister from a parallel universe! Does your moms top-secret research at her science lab have something to do with this? And can you and your sister figure out how to unite your broken family and stop an evil scientist from using your moms technology to take over the multiverse?