The Combined Maze by May Sinclair

Wauchope, who hadn't a nerve in his composition, recovered soon after he got into the open air. But in Ransome, without intermission, the magic of that incantation worked.

The symptoms of its working were a frightful haste, anxiety, and fear. He left Wauchope without any explanation, and rode off to his appointment at a dangerous speed and with a furious ringing of his bell. He was afraid that if he were late by five seconds Violet Usher would be gone. It was incredible to him that she should be there. It was incredible that it should have come to this, that he should be flying in haste and anxiety and fear unspeakable to meet her at the elm tree by the Causeway on Wandsworth Plain. The whole adventure was incredible.