This is it! The final book, and the one which explains everything.

Bess Hooper finally learns the truth. As this mystery unfolds, the origin of the time travel gift is revealed. Another riddle is solved in the process and clears up more than one question.
Without Eloise by her side, life is difficult, but not impossible and Bess learns to cope without her best friend, all the time questioning where she is.
Chased through time, Bess gets the fright of her life and after a short stay in hospital, she comes to the conclusion that there is only one answer, and that is to return the legacy, but will she?