A wild kind of magic - Stephen Elboz

The third in a series of books about Kit Stixby and his friend, Prince Henry, which began with A handful of Magic and continued with A Land Without Magic.The kidnapping of the visiting American president plunges Kit and Henry into another wild adventure. They have a race against time to rescue the president, and as if that weren't enough, there's a killer on the loose in London, vampires prowling everywhere, and a mysterious plant is coming to life...All three books in this series have been extremely well received with A Handful of Magic being picked as the Guardian's book of the month.