Tyree Campbell 
The Adventures of Colo Collins and Tama Toledo in Space and Time [EPUB ebook] 

Out on their first date, high school seniors Colo Collins and Tama Toledo are taken aboard a spaceship and offered the chance to intervene in various events in the Universe. These events can range from stopping an asteroid from striking a planet to helping someone find her house keys. But there’s a catch: both Colo and Tama have to agree that an intervention should be performed . . . and sometimes they’ll have to perform the intervention themselves!

Each problem they are presented has to be solved by critical thinking. In some instances, time travel and body-swapping with alien sentient beings is necessary. This novel is intended for an adult audience, but is certainly suitable for high school ages.