Geoffrey Trease 
Cue for Treason 

Fleeing from the evil Sir Philip Morton, Peter Brownrigg finds himself on the wrong side of the law. On the run to London he meets Kit and the two decide to stick together. But a chance discovery endangers their lives and soon Peter is deep in murderous plots, secrets and even treason.Set in the turbulent days of Elizabeth I, this classic story of danger and intrigue conjures up a world of mystery, twists and turns and thrilling action.