Teresa L. Jacobsen – Library Journal: Strung-out police detective Archie Sheridan, still haunted by serial killer Gretchen Lowell, returns in Cain's high-octane follow-up to Heartsick. This time the first murder victim shows up in a park, followed by spare parts in a nearby doghouse. But trouble truly explodes when Hannibal Lector-like imprisoned killer Gretchen is beaten, her guard hangs himself, and-we saw this coming-she escapes. When Gretchen threatens Archie's children at school, he goes off the deep end and concocts his own plan to bring her in. More interesting is the subplot involving intrepid newspaper journalist Susan Ward, who loses her mentor in a suspicious car crash that also kills the popular senator whose sexual escapades she was planning to expose. Trouble is, her source shows up dead, too. Straddling both cases, Susan convinces Archie's partner, Henry, to drive straight into a major forest fire because she has figured out Archie's location. Sweetheart struggles under the weight of our expectations; it doesn't work well unless you've read the astonishing Heartsick. Nonetheless, expect high demand and a large marketing campaign. Recommended for all popular collections.