Shadow and Spell. The Cannington Chronicles, #1

One night. One game. The future at stake. Cannington's witch has a job to do. Once a foundling, Gwen now lives a quiet life in the idyllic English countryside, raised by two loving mothers. But of late, rumours have begun to circulate; a local café once known for its average coffee and disappointing pastries, is suddenly luring customers from all over the country. When Gwen takes it upon herself to investigate, she discovers a new barista who's taking more than just customers' money.
Armed with wit, courage, and a little magic, Gwen must outsmart a creature older and more cunning than she can fathom. The game is on - and the clock is ticking.