Joy Delaney has gone missing, but her four adult children and her husband take their sweet time about reporting her disappearance to the authorities.  She left them all a cryptic text message, but then the housekeeper finds Joy’s phone under the bed in the Delaney house.  Joy’ husband, Stan, with whom she ran a successful tennis academy, seems the most likely suspect, especially since he is enigmatically unconcerned.  Even more curious is the former presence of Savannah, an injured waif who showed up on the Delaneys’ doorstep several months ago and proceeded to insert herself into the household.  The fact that two seemingly intelligent adults would allow a complete stranger to move in and take over the cooking and housekeeping is incomprehensible, but then many aspects of this book are absurd.  What’s not absurd is the number of family secrets that trickle out one by one, adding intrigue to the mystery of Joy’s whereabouts, as well as dispelling the myth of the Delaneys’ perfect marriage.  Three of the four children have their own share of secrets, including, in some cases, the fact that their marriages/relationships have recently gone bust.  The plot sizzles at times, but this book falls more squarely into the cozy mystery category than the thriller genre.  The writing style is too simplistic, and the characters are too even keel to rev up our heartrates and inspire us to become truly worried about Joy.  Everyone, including the reader, seems to feel that Joy will turn up sooner or later.  Also, the author is not the least bit subtle about sharing odd tidbits that turn out to be incremental to the plot, such as the ugly rug, the dog that eats paper, the cat that steals laundry, and, of course, the hotshot tennis prospect that got away.