Sheila Nicholls has a battery-acid wit, a fierce fuck-off rebellious streak and a drop-dead gorgeous mug -- which is to say she‘s a hell of a dame. But the singer-songwriter-pianist’s most appealing attribute is her deep intelligence. She proceeds thoughtfully, questioning her motivations, mapping out her goals. And then, when everything has been carefully laid out, she executes a perfect swan dive off a cliff, 100 feet into the waters of uncertainty.