Despite the contemporary setting, it might as well be 1938-- Agatha Christie time--aboard the Queen Guinivere, where p.i. Regan Reilly has been persuaded to travel to New York with dotty old Lady Veronica Exner. Both Regan and Lady Exner are recovering from a jolt: Just before they shipped out, the body of Regan's ten-years'-missing college roommate, Athena Popolous, was discovered during a reunion at St. Polycarp's, right around the corner from the Exner estate. Could the killer have been Lady Exner's nephew and heir-apparent, stammering Prof. Philip Whitcomb, or his improbably sharp-eyed fiancÇe, Val Twyler--or one of the stable of stock villains trying to rob or kill Lady Exner aboard the Queen Guinivere? Fortunately, a stable of equally familiar-looking shipmates (including Regan's universally adored suspense novelist mom, obviously modeled on first-novelist Clark's own famous mother) is on hand to help Regan to a revelation that's a lot less surprising than you might expect. Welcome flashes of mild humor don't lift this from the humdrum.