Since She's Been Gone

Willa Thompson is dead. She committed suicide. Her twin brother, Noah Thompson, was very close to her. Now, Willa's best friend, Nadia, and Noah have to learn to cope without her, with the help of each other. With Nadia close to following her and Noah blaming himself, will they ever get over her? The whole school looks at them different. Noah and Nadia start falling for each other, but would it be what Willa would want? Is that not honoring her memory?