Bye-Bye, Black Sheep

Description for BYE, BYE, BLACK SHEEP by Ayelet Waldman:

Their fledgling detective agency has spread its wings-and now Juliet and Al are finally flying high. They're used to seeing many people come through the doors of their garage-turned-office, seeking their help. But they're about to realize that they ain't seen nothin' yet.

Heavenly has come to Juliet with a story too sad for any detective with a conscience to turn down. Her sister, an addict and streetwalker, has turned up dead-and the police couldn't care less. With any luck-and with plucky Juliet doing all she can-Heavenly will bring the killer to justice. But it's hard going undercover when you're a tall, gorgeous transsexual.

This is #7 in A Mommy-Track Mystery.