When the artist Marianne Glass falls to her death, everyone insists it was a tragic accident. But Rowan Winter, once her closest friend, knows better.

Marianne -- and the whole Glass family -- once meant everything to Rowan. Their lively, intellectual household offered a world of possibility and the warmth and encouragement missing in her own home. But the friends have been estranged for a decade when Marianne dies, and of those years Rowan knows only what the papers reported: Marianne's swift ascent in the London art world, her much-scrutinized romance with her gallerist.

Now, Rowan knows she won't rest until she discovers the truth about Marianne's death. The questions multiply: Is someone breaking into the Glass family house? Who is the man who watches at night from the opposite window? The deeper she goes, the more convinced Rowan becomes that something was -- and may still be -- very wrong. But some secrets are best left uncovered. And some can even be lethal . . .