At Cape Three Points on the beautiful Ghanaian coast, a canoe washes up at an oil rig site. The two bodies in the canoe – who turn out to be a prominent, wealthy, middle-aged married couple – have obviously been murdered; the way Mr. Smith-Aidoo has been gruesomely decapitated suggests the killer was trying to send a specific message – but what, and to whom, is a mystery. The Smith-Aidoos, pill...