When all the second grade students must enter the science fair, which has global warming as its theme, best friends Ivy and Bean team up to create an unusual project.

When a middle-aged woman enters Lina Townend's antiques shop wanting to sell a white Beswick china horse which she claims is a cherished heirloom, Lina's instincts tell her to avoid the sale. Suddenly, wherever she goes, Lina sees the supposedly rare white horses. Something strange is afoot, but it is only the tip of the iceberg. Soon, with her business partner Griff laid up in hospital and her relationship with her boyfriend Morris floundering, Lina...