Time for a Change (The Rhythm of Time, Bk. 2)

Time for a Change finds Rahim and Kasia trading the safety of school halls for high-stakes missions with Aevum, a future-born outfit guarding history’s flow. Sent to 1978 Honolulu to secure a mysterious rock, they’re swept into a chase across eras—dodging rival time travelers, doubles, and dubious robots to prevent catastrophe.