Dream Girl - Robert Parker

When a mature, beautiful and composed April Kyle strides into Spenser's office, the Boston PI briefly hesitates before recognising his once and future client. Now a well-established madam herself, April oversees and upscale calgirl operation in Boston's Back Bay. Still looking for Spenser's approval, it takes her a moment before she can ask him, again, for his help. Her business is a success - what's more, it's an all-female enterprise. Now that some men are trying to take it away from her, she needs Spenser's help.