7 best books of June: Amazon editors' favorite picks
2. "Sister," by Rosamund Lupton
When her sister Tess is found dead in an abandoned building, police tell Beatrice that they suspect suicide. But Beatrice is sure her sister's death is a murder and she must investigate. Early readers have called this debut novel – which is much about the relationship between sisters as it is a murder investigation – both "Hitchcockian" and "deeply psychological."