The White Tower by Margaret Armand Smith
Not as exciting as the first (One Sun, One Moon, Two Stars) but still a good read. Jonathan, Ben and Victoria go back in time to Tudor London, this time to save their friend and mentor, The Gleeman, from imprisonment and possibly execution. Accompanied by their new friend Tamara, they take up jobs in different parts in the city including the Tower of London to try and find their friend, and risk a lot in the process.
It has a very dramatic ending involving a public execution!
8/10, Adam (12 yrs)