The Reluctant Assassin (W.A.R.P. Series #1)

Riley, a teen orphan boy living in Victorian London, has had the misfortune of being apprenticed to Albert Garrick, an illusionist who has fallen on difficult times and now uses his unique conjuring skills to gain access to victims' dwellings. On one such escapade, Garrick brings his reluctant apprentice along and urges him to commit his first killing. Riley is saved from having to commit the grisly act when the intended victim turns out to be a scientist from the future, part of the FBI's Witne…