Sissy Holmes and The Case of the Dead Hypnotist

What is reincarnation? Sissy Holmes doesn't have a clue until a hypnotist (soon to be dead) delves too deeply into her psyche. The voice inside her head says he's Sherlock Holmes and wants to investigate the murder. Sissy thinks she must be crazy.
As events unfold, she's convinced she has no choice but to investigate with the help of Sherlock Holmes and her best friend El.