The Agent of Escondida

Book 2 of 5 in the Treasure of Escondida mini-series.
"Tony, one of the thieves, spots a woman in the castle as he attempts to evade the guards. Sent to locate a hidden room, he and his companions fail but the woman appears to recognize him and even says his name. Confused and frustrated, Tony returns to headquarters, not sure who or what to believe.
When Julia comes face-to-face with one of the thieves, she recognizes him instantly as her ex-fiancé, Tony - only he doesn't seem to know who she is. As the team researches Tony's involvement, secrets are revealed and Julia must figure out her personal feelings towards Tony before he strikes again."