Poison, Your Grace (Simon & Elizabeth Mysteries)

When one of Edward VI's council members is poisoned, Elizabeth fears a plot against her brother the king. Her fears worsen when whispers surface that she herself is responsible. With no one she can turn to at the palace, she asks her old friend Simon Maldon to help her prove that she isn't guilty of murder and treason. The two old friends face a clever killer who cannot be caught and will not be stopped.