Murder in the Palais Royal

Just as Aimee is about to leave for New York City to follow up on a lead about a possible younger brother, her partner in Leduc Detective, Rene Friant, is wounded by a near-fatal gun shot. Eyewitnesses identify Aimee as the culprit. The police have pegged her as the guilty party. Aimee is distraught over Rene's condition and horrified to be under suspicion.
At the same time, a large, mysterious sum appears in their firm's bank account, and the tax authorities descend upon Aimee. She has no idea who would have sent this money.
It seems that someone is impersonating Aimee, someone who wants revenge. But for what? Two murders ensue. How do they relate to the youth whom Aimee's testimony sent to jail in the very first Aimee Leduc investigation, "Murder in the Marais"?